Dell Dimension E510 - Video Card Recommendation Needed

Hello,

I am trying to help a co-worker whose computer seems to be in need of a new graphics card. The first sign of trouble was a "device driver got stuck in an infinite loop" blue screen warning of "a problem with the device itself or the device driver programming the hardware incorrectly." In addition, vertical lines appeared as the system booted (they went away after Windows wallpaper loaded).

A few of the essential details about the computer:

Dell Dimension E510
Intel Pentium 4 Processor 650 with HyperThreading technology
Windows XP Media Center 2005 Edition
1GB Dual Channel DDR2 SDRAM at 400 MHz (4x256M)
128MB PCI Express x16 (DVI/VGA/TV-out) ATI Radeon X300SE Hyper Memory video card
Chipset: Intel 945G Express
Video: Integrated Intel Graphics Media Accelerator 950 (GMA950)
Power supply: 305W (that's three hundred five, not three hundred fifty)

I went to the ATI site and downloaded, then installed, the Catalyst Center with updated drivers. Unfortunately, that wasn't of much help. After just a few minutes online, "VPU Recover has set your graphics accelerator as it was no longer responding to graphics driver commands" would display. I saw a post on this site that suggested removing a specific hotfix for Windows XP (KB952287) as a possible remedy ... no luck with that.

Now the computer boots but the monitor, a Samsung SyncMaster 226BW, is no longer receiving a video signal from the computer.

I'd appreciate a little sound advice in choosing a compatible replacement video card so that we can get the system running again. Please keep in mind that this is a nearly five-year-old computer. Ideally, the owner would like to keep it for another year or two before investing in a new system. The computer is used mainly for productivity (e-mail, word processing, etc.) and occasionally for entertainment ... nothing more strenuous than streaming video and an occasional visit to mlb.com and definitely no gaming.

Here's a link to the service manual, where complete system specifications can be found if additional information is needed:
http://support.dell.com/support/ed [...] /index.htm

Will either of the following cards work, or is there something out there that's an equal or better fit for an aging system with a not-too-beefy PSU?

EVGA 512-P2-N747-LR GeForce 8500 GT 512MB 128-bit GDDR2 PCI Express x16 HDCP Ready SLI Supported Video Card
http://www.newegg.com/Product/Prod [...] 6814130285

EVGA 256-P2-N753-TR GeForce 8600 GT 256MB 128-bit GDDR3 PCI Express x16 HDCP Ready SLI Supported Video Card
http://www.newegg.com/Product/Prod [...] 6814130297
(Even though this one supposedly specifies a 350W power supply, a couple of customer reviews mention positive results with 250W and 300W power supplies.)

Thanks in advance.