NRTC = National Rural Telecommunication Cooperatives. Traditionally they are the co-op (not for profit) organizations that provided electric to rural America. Now some of them offer Exede.
Anyhow, IMHO, if you can get Exede from a NRTC, do so. You can get 10GB for the same price as 7.5GB from Viasat AND you get the LNFZ. Hard to beat that deal.
do they offer a higher package? 7.5 just aint gonna cut it I don't think. 10 .. maybe.. Right now I get 14.something GBs (not that I use it) daily from hughesnet.