what to buy.

[The*rc*dude]

ok, i have a e-maxx with gorillastraps ready for my to get some 7 cell batts but other than that it's stock and pritty muddy lol, i also have a rustler with a mm7700 but only on 6 cells right now and a traxxas wheeliebar. i also have a t-maxx2.5 with a new 3.3 engine and lots of stuff to go racing. i have a decent bit of money right now and i'm really strongly thinking about getting 2, 7 cell batts or a 2c lipo right now. should i get the batts right now or something elts? if i get the batts i'm also going to haft to get a new charger(mine's in really bad shape) to go with them and what batts should i get?? i'm going to get some matched packs no matter what though.