yes you can, and sata III (6gb/s) isn't even any better for the hdd, they don't even manage 3gb/s. also what case and psu are you looking at? and also if you want it to work, unless you plan to use linux you will have to buy windows7 which costs 100
Hey hey. Well, I guess I'll list my build here for you (what I have so far anyway).
I'm a professor, and one of the benefits is they sell us computer software licenses REALLY cheap. How cheap? I just picked up Windows 7 professional for $6 today.

In all honesty, I'm considering installing Ubuntu Linux on the machine anyway, but we shall see.
Anyway, on to the build:
AMD Athlon II X3 450 Rana 3.2GHz: $77.99
GIGABYTE GA-880GMA-USB3: $82.99 (after $10 rebate)
Thermaltake Commander MS-I ID VN400A1W2N: $39.99 (after $10 rebate)
COOLER MASTER eXtreme Power Plus RS500-PCARD3-US 500W: $29.99 (after $10 rebate)
Seagate - Barracuda 1TB: $55
That brings me to the $290-ish (if you count the windows 7)
I still need to find a cheap optical drive and the memory.
How is this looking so far? Everything seem to fit together okay? This is my first build. (I realize this doesn't really belong in this thread anymore...)
It's worth mentioning this is a system I'm building for my parents for Christmas. It doesn't need to be worthy of gaming, just e-mail, net, light video, and music.
Let me know what you think. I could use all the feedback you have.

(And thanks for all the help so far).