MB 915/G Combo MS-7058 video card options or suggestions on the new market

Question

First off my apologies. I wasn't sure which forum to place my question under,
Retired Motherboards or Video Cards.
Quick summary I'm looking to upgrade my video card on an older mother board and have run into problems with a new board working. I think the problem is a backwards compatibility issue.  I need help  with a list of what video cards I can buy that are available new preferably if not a list of where to go and what to watch for. I would like to increase the speed/ram. My skill level is around, open the case swap out the item and insert the disk. With a search forums and try to find the answer/follow directions or suggestions.
In more detail,
I'm looking to upgrade my video card from NVIDIA GeForce 6 Series  NX-6600  256mb card on a an MSI 915P/G combo. The install/instruction manual lists under the above combo name MS-7058 (v1.X) ATX Motherboard and  below the image of the board there is also the text of G52-M7058x1. 
The video card option for placement is in the sole PCI Express X16 slot (no on motherboard graphics and/or connection options I know of)   and I assuming from what I've tried researching that the PCI Express x1(mentioned elsewhere but all suggestions were cards no longer for sale) is some sort of standard of limit and my motherboard is too old despite newer cards fitting into the slot and claiming backwards compatibility to the "PCI Express or Pci Express 2.0". 
Part of that possible assumption of my issue comes from the fact the mother board can have ether DDR1 or DDR2 ram for memory  but a video card with DDR3 ram would not work. Also the software from the included disk and from the from the website install correctly for the card to function other than the basic windows drivers leaving the card unable to run any games.   For reference the video card purchased and tried was a  EVGA Geforce GT 610 SC9super clocked) with 2 GB of DDR3 Memory. Which i hopefully will have returned for a refund soon.  I spent most of the day trying to install the software by their program , by launching from disk directly, from downloading the most current version from the manufacturer's website and checking with Microsoft for possible system change updates.
My original invoice August 2005 lists the  pre order lists the Item VGMS-NX6600/256E   then under description MSI NX6600-TD256E/PCIEX/256MB for the grand price of $169.00  deleviery receipt lists the card as item VGXM-X66DHEJTZ1   Description XMEDIA 6600 256MB PCIE DVI/TV
Power Supply 630 watts installed July 2008 I can not get the full listings of voltage and amps per connectors without taking the powers supply loose from the case(which requires shutting the system off, so I hoping I won't need to but will if the information will help). I do not feel power is an issue due to the size and the power supply was unneeded upgrade,  that I just wanted to replace when swapping out a motherboards damaged from a lighting hit or power surge. System was running fine for years.
General system information
Windows XP professional SP3 All updates current.
Intel Pentium 4 3.2 GHz
2.00 GB of Ram DDR 1
Videocard  NVIDA 6600   Driver 6.14.12.9573
3 hard drives of varying sizes 500GB,1TB and 2TB  Plus one external  with external power supply 1.5TB drive
If more information is needed please let me know.
The best advice and help would be a list of currently for sale video cards that will work with links to places (and the actual model even better) like New Egg,  or if there is such a card at the local Best Buy(outstanding advice on this non compatible/working card....I won't digress into my own mistake of buying there). I'm way out of date on information and standards about computers and hardware and need help  figuring out what Video Cards to look at for purchasing.   Preferably new, then re manufactured with warranty then used...  The main game I play that strains my system but is playable is call of duty modern warfare 2 and would like to run 3 if possible. Although better rates with COD MW2 and COD 4 MW.

Answer 1

100% correct on the mother board
The card I had tried was EVGA---GeForce-GT-610 2GB DDR3 I can't post external links but it was from Best Buy. The  box claimed requirements are that it needs PCI Express or PCI Express 2.0 compliant motherboards with one open graphic slot.  The best I could get out of it was slightly working with Windows XP basic driver which no games would run. No selecting drivers helped from the Add Hardware program.
So I should make sure it lists "PCI Express X16" and  " version 1 " "1MB(in reference to what part?)" or words to that effect?  I was mislead by the box above for capability and "NVIDIA" on it, am I correct in assuming it was a generic whore knock off which bought the rights to stick NVIDIA name on the outside for a standard or software?  Especially since the actual video card says EVGA and not NVIDIA on it....  I won't make that mistake hopefully again.
Due to age I was buying a cheap fill in card,(old one was working fine but I figured a good training/practice exercise and to see how much better the games looked  to encourage me going forward on my first build) until I can start ordering and building to  the current upgradeable standards.   I'm trying to catch up on standards and not  have a firewire or zipdrive experience. Although I might put a 5 1/4 disk drive in unused bay for show    I would prefer not to buy another per-assembled option and decent computer part stores near me are lacking. Or I lack knowledge of their locations. If it matters I'm in Charlotte, NC USA
My budget is up to about $200 although I would like to stay around $100.00 (usa dollars) if possible. I think that gives me realistic options even with places like Best Buy. If I'm not, please correct me. I'm aware best Buy will give me a special 30-50% price increase  but my local options for shops are hurting, the "best place for reputation" is a story of shame.