Your SFF is too short.... the Q2000 is a full height card but the SFF only accepts the shorter cards, with a short backplane adapter plate.
We use lots of the Q2000 and Q2000 cards.... like both of them a lot, but they are not short enough for your box.
My favorite alternative for the SFF height workstations is the Quadro K600, or K620 (more expensive and not really faster). Go on eBay and take a look.
With W7Pro64 you can do WEI speed testing. The Quadro 600 gives 2D/3D of 6.6/6.6, while the K600 gives 6.8/6.8.
A 0.2 jump in performance is worth getting, and the Quadro K620 gives the same 6.8/6.8 performance with a bit more wattage used and more VRAM (2GB versus 1).
I'd buy the K600, personally, unless you really need the higher VRAM..... and make sure to get one with the SFF short plate on its butt end. Check on eBay to see how the two plates look different. And, you'll get very close to Q2000/Q2000D performance.