Small Form Factor Video Card Recommendation :)

Hi again. I previously posted a question about the a video card for pc gaming and came to the conclusion that i wanted an ATI Radeon 4670. However, i just realised that my Dell Optiplex 755 is the 'desktop computer' version instead of the 'mini tower'. I know how stupid it sounds that i only just figured that out, but i'm very noobish . Here's the manual that shows the three different versions; http://web.mit.edu/ist/topics/hard [...] hspecs.pdf

So anyway, i was wondering if anybody knew a small form factor video card that's roughly near the Radeon 4670 in power (if such a thing is possible) and is compatible with my pc. It's just that i'll be stuck with this pc for a while, and the Radeon 2400 (which the pc came with) can barely play anything from the last 3 years .

Here's my specs just in case;
Dell OptiPlex 755 desktop computer
Intel Core 2 Duo - 3 GHz
2 GB RAM
ATI Radeon HD 2400 (256 MB)
PCI-Express X16

Edit: Also, i was just wondering if anybody had any comments on the 9500 GT low profile for gaming, as i've found one off ebay that i like http://cgi.ebay.com.au/ws/eBayISAP [...] K:MEWAX:IT

Thanks for the help

Cool thanks. I forgot to mention that i'm looking to be able to play most recent games smoothly but at medium settings and at a fairly low resolution. Particularly i wanted to make sure Mass Effect 2 would work without lag. So with that in mind is the 9500 GT still a possible, or is it just too low end. Thanks for the help

Thanks for the reply again . I should look into getting a 9600 GT then.