My MBP is my main computer, along with an external display. I almost never use it as laptop except for the occasional class or when I travel. If I had to do it again I would seriously consider a 27" quad iMac and a white MacBook for traveling, the MBP is nice, but I don't like hauling $2800 around with me everywhere, so it spends 98% of it's time on my desk.
My 15" MBP (aluminum) is my basic do everything computer. It has never once failed in that regard and really does get everything done. It has the perfect mix of speed, style, quality and portablity. I love it and swear by this machine. The only thing is that its getting a little bit old when I look at other peoples computers and the chassis flexes alot now, but thats ok, it still does what its supposed to do as a computer