Up to you, i like bec's cause theres less to mess with, but its up to you. Those escs i listed would work great, i have a 18a one of those on an inrunner and i havent had any problems. Ill link it for you,
[link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=4882]2 of these motors[/link]
[link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=3728]2 of these esc's[/link]
[link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6346]2 of these lipo's[/link](or if you decide you want to go cheaper, 4 6-cell packs would work as well