In my house (new) I get low to moderate Tmobile coverage, but Cingular is pretty strong (on 850). Everywhere else around the city they are pretty even. I stick with Tmobile despite the sometimes dodgy coverage for this EXACT reason. I don't have to pass on phones just because of band issues.
Not poking at anyone (Ate Fifty, I read your post about the sweet deal you have with your company) this just reminds me of why I do put up with Tmobile.
Of course not being popular (and thus not really having anyone call me) helps when I have low -> no reception.