I just bought this card a couple of weeks back. It's nVidia based and works great, needs no power connection, runs cool (never above 45c/113f so far) and has a good easy to understand interface.
I'm no gamer, so have no idea how far it can be pressed, but bought this for an old Dell P4 3.2ghz XP box that always skipped (approximately 1.5 seconds) with YouTube at 720p, but now can watch 1080p with rarely a frame skip.
http://www.amazon.com/gp/product/B0049MPQA4
EDIT:
EVGA GeForce 8400 GS 1 GB DDR3 PCI Express 2.0 DVI/HDMI/VGA Graphics Card, part # 01G-P3-1302-LR
http://www.evga.com/Products/Product...01g-p3-1302-lr