I'd say wait if you can. I have a 12' powerbook and a dell desktop. (I know I know). I graduate in May from undergraduate college and this media center mini is calling my name.
I want to get all apple computers, (a mini for a tv) after I graduate, so I'll probably wait until the summer for the mini, if you can wait, do it. Just remember the 'new' iMac G5 that was replaced 3, 4 months later?
I say wait as long as you can, get it when it first comes out, and you'll have the best shot at getting what you want without feeling like you bought some out dated products a month later. my 2 cents