Avoid the losi system. I had one which worked ok in itself, but could never even get the software to install on my PC to even try and update the firmware and sold the car it was in and the system before i managed to sort it. (and I'm reasonably capable with computers normally).
I would suggest a 7.5 / 8.5 for 2wd. I've always ran a 6.5 and found it hard to handle with nimh let alone lipo
