I'm looking to build a pair of SFF PCs from the windows 7 era with a Phenom II and a Core 2 Quad with DDR3 in the tacky mid-late 00s/early '10s style.

I've gotten the nVidia PC's (AMD model) specs dealt with, but I'm theming the ATi PC (Intel model) around the aesthetic of the turrets in the Portal series and because they're both using rival companies' hardware like the in-game rivalry between Black Mesa VS. Aperture.

I found that nVidia's 9-series GPUs had low profile versions all the way to the 9800 models (I'm planning to use the 9600GT slim from Sparkle), but there doesn't seem to be much for ATi Radeons of the era. (Terascale 2 ideally)

Is there anyone who knows that the best Terascale 2-based GPU is that has a low profile version?