Might I make one small suggestion? Buy the minimum configuration ($599) and then hop over to Amazon.com and drop $58.99 on 16 Gig of RAM. It's super easy to install, and works like a champ! Or, you could pay Apple $200 to install them for you. I did, and shall we say that the performance of the i5 chipset on the Mac Mini absolutely screams when you go from 2 Gig to 16 Gig.
IMHO, best $60 upgrade you can buy.