G-hawg, we just switched our business phones over to Nextel for the 2 way feature which is awesome. I have been told that once you get out of metro areas and off the major interstates the reception is terrible, but we don't travel far out of the metro for biz, so that is not a problem for us. Where you live and where you travel would be a definite priority in looking at Nextel. I have never used AT&T so I can't comment on them. My personal phone is Verizon and I am very happy with it. Reception is great and they have big coverage area.
TV, there aren't to many plans that allow you to rollover your minutes in the states. A few are out there, but I am not familiar with the company and what type of reception and coverage they have. My old plan with Verizon had it, but they discontinued it last year.
If you don't know anybody else using Nextel and the two way feature, there are probably better phones out there as far as comverage and reception is concerned.