You dont need a brushless esc to run a lipo............you simply install a $25 dollar LVC (novak) directly to your esc.
Here is an inexpensive ESC, and i will
swear by it..........
never one problem (i own 13 of them), has reverse, can handle 7 cells, or 2s lipo (with lvc) - $29 -
http://www3.towerhobbies.com/cgi-bin...?&I=LXAMN7&P=7
Here is the motor i will
highly recommend, top notch - $33 -
http://www3.towerhobbies.com/cgi-bin...?&I=LXLXT7&P=7
Here is a 2s lvc - $25 -
http://www3.towerhobbies.com/cgi-bin...&I=LXPGM8&P=ML
Total $87...........................Throw your 2s lipo in and go