[snellemin]

3s A123 with the quark should run nice. You will only see longer run times with a 2P pack. If you gear high, then the 2P will be beneficial speed wise.
Yesterday I ran the B50 5s hacker with 3s A123 on the hacker sport ESC and needless to say I smoked the ESC within a minute of use. The thing just melted away.

In my Rustler, I snap the HPI dogbones with 6s A123 and heavy beatlocks wheels. Will be going over to the heavy duty HPI dogbone setup this Saturday. When the MGM 16024 comes in, I'll be running 7s A123 in the Rustler and see how well it holds up.