Yes the MBP is fast but the iMac 24" 2.4 is the same speed and the 2.8 Extreme is faster! Plus how many screen are you really going to need? Also, if you go with an iMac and a MacBook, you will get the best of both worlds. Plus you will have two separate computers. If something happens to one (like a stolen laptop, oops dropping it, etc) you have the other one to back you up. Oh by the way, it totals out to about the same for an iMac and MacBook together compared to a MBP and a separare screen. Trust me you will want a new screen. You will be looking more at the MBP screen, it will be nicer than your 19". This is my opinion. Good Luck!