Need help understanding PC vid card options in MP

Hi all,
I have a 2008 MP with the 2600 XT video card, but I just installed Windows 7 via Boot Camp and decided I'd like to get a second video card just to play games in Windows.
I do know that a PC video card won't work in OSX unless flashed, but I'm just not entirely sure about buying and installing a PC video card for Windows. Can someone help me with answers to a few questions?
1. If I install a PC video card in the 8x PCIe slot of the Mac Pro, does it have to be a particular type (i.e. have a particular type of DDR onboard, have a particular mHz GPU processor speed, etc)?
2. I've read many vague references to power requirements, but I've yet to read something that clearly states whether I will need to rig up some kind of additional power to the second card. If I do, what exactly would I need in terms of power adapters/cables? (my 2008 Mac Pro is completely stock right now).
3. I would be buying a DVI KVM switch in addition to the video card. With the switch and the 2nd card installed, would I be able to see the "hold down the Option key" boot loader screen as long as the KVM switch is set to the OSX video card, choose Windows, and then use the KVM to switch to the PC card so that I can use it in Windows?
4. Does anyone have any recommendations of a good PC video card for gaming, in the $50-$100 range, which are also potentially flashable for use in OSX? I'm not ready to take that flashing step yet, but I figure as long as I'm buying a PC video card, I might as well get one that can be flashed if I decide to do that down the road.
Thanks folks....I've done a lot of searching on this issue over the past two days, but just can't seem to find any clear, straight answers.

Good and $100 or less don't compute!
Suggestion: get the Apple ATI 5770 ($249), if you like it, get a 2nd for Crossfire.
http://store.apple.com/us/product/MC742ZM/A
The 2600XT has trouble enough, and now seems like the 5770/5870 don't get along with it.
Each card would say what it needs as far as using aux pcie power cables.
Apple's write-up on requirements are just off the farm in regards to
Requires Mac Pro (Mid 2010) with PCI Express 2.0 slot
Works in all Mac Pro models.
Your 2008 MP 3,1 has two 16x slots.
The ATI Radeon HD 5770 graphics card requires one auxiliary power connection and the ATI Radeon HD 5870 requires two. The Mac Pro provides two auxiliary power ports.
More about hooking up displays and adapters:
http://support.apple.com/kb/HT4279
http://www.barefeats.com/wst10g7.html
http://www.barefeats.com/wst10g6.html

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