$849 retail is incredibly expensive even for retail. As of not too long about the retail on a 5s was $650. Going with the next plan and paying the $650 was a much better deal than signing a 2 year contract and paying an additional $600 in line fees because you lose the $25 dollar discount on top of paying the $199 for the phone plus $40 upgrade fee and tax on the $199.
What $650 deal on NEXT plan?