X1900XT not working in late 2006 Mac Pro.

Hi, I'm new here, just created my Apple ID to post this problem on the forum for some info and advice
I have a late 2006 Mac Pro which I ordered from Apple.com with the ATI X1900XT. I had the standard 20", LCD Apple Cinema Display which doesn't work anymore.
Someone lent me a Phillips 190S LCD monitor to work meanwhile with my Mac Pro. So when I used that monitor I also upgraded from Tiger to Snow Leopard (can't remember how, if first Leopard and then Snow). It worked so so... some weird pixels flashing and sometimes the monitor image would freeze up, I'd shut down the Mac from the Power Button and start it again and keep on working like that. Until one day, image froze up, did the routine start-up but no image would show up on the monitor.
I've already sent my Mac with a certified Mac tecnician, he told me the ATI X1900XT doesn't work anymore (along with 2 DIMMS, I know one was "fried", the other came as a surprise to me because the Mac seems to boot OK, initial Mac "chime" sounds and riser cards don't "light" a problem) and I need to buy another video card. I asked him for more options on video cards but he tells me he'll only assure success from his part if I buy the same ATI X1900XT model through him with his provider ($350+$20 shipping, I live outside the States).
My questions are:
- What other choices for video cards do I have with a late 2006 Mac Pro nowadays? (Not counting the nVidia 7300 GT, the Quadro FX 4500 or "flashed" PC cards. I read an old post https://discussions.apple.com/thread/2012005?start=15&tstart=0 in this forum on a similar topic but seems people were using Leopard, not Snow or Lion).
- Is the use of a non-Mac monitor relevant to the detereoration of an ATI X1900XT card or any original Mac video card? I ask this because if I buy the same card again, I want to know if I can keep using the same Phillips monitor or buy a non-Mac monitor without worrying that it'll do something to the video card.
Thanks in advance for any advice and info

I have the same mac pro 1.1 as you do. I bought it with the ATI X1900XT video card and it lasted only like 2 years , then the screen became garbled, pixel flashing,,,
I replaced it with ATIRadeon HD 3870, it has been working fine since then but that card is a little noisier than the X1900.
I think you can also use some cards like this one from macsales. You should just check that page and see what you find.
Apple MC742ZM/A ATI Radeon HD 5770 Graphics Upgrade... in stock at OWC

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