A good rule of thumb is to always have 30% "reserve" in your power supply, at least on a high end gaming rig. Here are some reasons:
1) You want it to work on the hottest day of the year, where its output could be a lot less than in ideal conditions.
2) Capacitor aging can decrease the output...
LOLright? :P in grad school I carried a Gateway FX 17" everywhere.
Although even really strong people have to watch how much they regularly load their lower backs...
Short answer: No. You cannot install two different nvidia display drivers at the same time.
Long answer: Kinda. There are hacks out there to make the driver think that the Quadro is a Geforce or vice versa, but that kind of makes me nervous given that a workstation usually has to be 110%...
Nice price! Too bad you still can't find a combo for less than $100, since the i3 2100 beats this in many tasks while using less power.
If you can overclock this a bit and unlock the extra cache, it might be a helluva deal.
I use 2 screws on either side of the thing. Just make sure you use some "regular" fan screws in the remaining two holes of the fan that is actually connected to the case. It works fine.