ok i havent read the whole thread,
but,
i think u should skip the 820, but not Nokia
820 is kinda an obsolete deveice,
i think the 720 is better than the 820 in every way, except screen size and cpu/rams... maybe an issue with u? but i would think really hard and carefully for this one
the 720 is especially better in the battery part(ALOT better), and camera(also alot better)
hence why both are almost at the same price point atm
if your gonna going to buy another upgrade relativly soon(1-1.5 years, ), go with the 720
there isnt a huge price gap between the 820 and the 920 either, the 920 is a GREAT device apart from its battery(i own one, battery seems to be bad in all lumias except the 720(not sure about the 1020).. so if you got extra cash, 920 it is
i hate samsung, like most people here
, but i dont think its right to recommend the 820(battery issues,but u can alwayz buy an extra battery, bad camera , not so pretty etc)