Cases are comparable, PSU's are comparable but CP has edge in quietness.
MoBo - With Intel's hexacores about to grop on March 16, new MoBos are waiting in the wings for all the publicity surrounding the launch. I'd hold out for the Rampage II Extreme but if ya gotta buy today
HSF -For performance and ease of installation on ya 1st build, the Prolimatech Megahalems fits both criteria. Here's what I'm putting in new builds Mega w/ IC Diamond TIM and twin Scythe PWMfans (make sure ya MoBo can handle the fan wattage). ($95* for the HS, TIM. two PWM fans and a Y cable splitter). If not doing serious OC's, drop the splitter and 2nd fan
GFX -a lot to be said for waiting 3-4 weeks till fermi hits, ATI answers and market stabilizes....but, at your resolution, I'd drop in a 5870 now and then grab a second one come XMas time. A single 5770 is a no-no as it can't maintain 30 fps in DX11 games at your resolution.
NOTE: You said you wanted 3D Vision which is a nVidia only technology.....if that's the case, you will have to scrap the ATI cards and go w/ nVidia. The new fermi, now called 400 series, cards won't be out for 4 weeks or so. One option ya can take is get something like a GTS 250 for "now". When the 400 series is out, you can relegate the 250 to a dedicated PhysX card.
Hard Drives - Check out the performance charts and pick whatever 500 GB per platter drive performs best under your usage patterns. The WD Black 2 TB is a good choice but at smaller capacities, you are limited to the Seagate 7200.12 or the Spinpoint F3. The 7200.12 excels in gaming, multimedia and pictures whereas the F3 wins at music and movie maker. See the comparisons here (copy past link in manually, link won't work in forum):