It seems even if you get the perfect BlackBerry, ultimately one or two things develop:
1. the trackwheel loosens up. Initially that's fine, but eventually gets to the point where it moves when you click and you thus get a different app or e-mail address.
2. the keyboard is loose. Drives some people (ok, me) nuts, but actually doesn't interfere with typing...and some above have said it even helps.
Not sure about you, but I realize the only way I can deal with these concerns is just to be less obsessive compulsive.
Easier said than done.