I've been waiting for a new 13" model only about a month now so no 6 month nailbiting for me. I currently own a desktop AMD 3800+ X2 with 1024mb DDR 400mhz ram (ancient). I think the basemodel will do great for me, ok it's not an i5 processor but do I really need a 15" model which costs €550 ($750) more only to surf the internet, watch an occasional movie and work with Ableton live and other music apps?
Also, the €550 will buy me a very decent 24" screen on the side with money to spare.
Yes the new 13's will be fast enough for you! I ran the latest version of Logic Studio and Live on my Oct 2008 entry level unibody with no problems! So you should be fine!