brushless questions..

[rcsammy]

i have decided im going to get a B4 and put a mamba maxx in it, will hopefully get the B4 soon but will run brushed while im saving for a mamba maxx

im kinda stuck between the 5700 and the 7700, i obviously want as much speed as possible which would be the 5700 if i ran on 12 cells or 3s lipo
but the 7700 would give me more speed for just general use which i would probably run 6, 7 or 8 cells on
im leaning towards the 5700 then i have the option to go insanely fast if i wanted

can someone tell em what runtimes would be like with 6 cells? 8 cells?12 cells? 3s lipo?

say i normaly ran 8 cells or somthing if i wanted to go out for some speed runs with 12 cells or 3s lipo would i have to change the gearing?

im not sure if i want to go lipo or not, what are the advntages of them?
60 mph with a 3s lipo sounds very tempting, although i have heard they are quite dangerous if overcharged or treated wrong?
how much am i looking at for a decent lipo and charger?


i think thats all the questions i have for now

thanks