You planning on getting an iPad? I just ask because aside from syncing your IPhone/iPod the other tasks can be done on one.15" MBP mid 2009. Bought it three weeks ago.
I use it mostly for internet, syncing iPods/iPhones, watching TV shows and movies in iTunes.
I sold my Mac Pro, iMac, 13" MBP and black MacBook and the 15" is my only Mac now and my main computer (still have a HP laptop for backup).
You planning on getting an iPad? I just ask because aside from syncing your IPhone/iPod the other tasks can be done on one.