It sounds like you had some negative experiences with your PB. I have had my MBP since March and although it has served me well, it has some pretty tolerable traits like processor whine, fan noise and heat...lots of heat. My 15PB screen went about a year ago - so you can say that I haven't had the best of luck with apple portables.
I just got a Mac Pro + 30" Cinema display at work and that's where I do the majority of work now. I love the power and the large real estate...and I don't have to worry about what I mentioned before, in addition to it getting stolen or dropping it or anything like that. But like the previous few posts have mentioned, if you need the portability, you can't go wrong with the MBP or Macbook.
Either way, you'll be happy!