Yeah just configure the drive to power down after inactivity rather than a 5400RPM drive, they're painfully slow
I've read some about using Xeons on the desktop, but what's your reasoning vs. just getting an i7? About the only reason personally I'd consider is to use ECC memory (which actually is kind of attractive).
Good choice with the SSD, I like the Samsungs, just got a 512GB 840 Pro, and the EVO is just as good. 128GB is VERY limiting.