Well, I was going to go with the 1TB drive, then I decided to plug in one of my 7200.10s to see what happened, and it didn't even spin up. So I guess it'll be the 7200.4, and I'll add a second one later. I['m still looking for a good cyber monday deal on a 2.5" HDD, but nothing so far.
I just had some major start-up lags that began driving me up the wall... went back in time via a restore point, now my computer feels like it's decked out with an i7