That system was also based on two BF deals, the Super Lanboy and the 160gb for something like $20 each. Try looking around at local stores for the best deals on cases and hard drives, especially in places like Best Buy and Circuit City for HD's, and Fry's for cases. You don't want to pay the 15-20 bucks shipping for a case.
I've had bad experiences with Directron, try to find some of those parts at NewEgg or a different supplier. I even prefer tigerdirect.com to them.
And that's not the PSU, that one's not gonna cut it...this one is:
http://www.newegg.com/Product/Product.asp?Item=N82E16817104952
Don't scrimp on the PSU. The case, eh, that's up to you. Antec and Coolermaster are two good companies you can get a fairly low priced case from.
-z