12th servo

[tamiyaterror]

hi all, new to this 12th lark and was after some advice. looking at running a gt12 as well as my touring car, and i just had a question about servos, ill most likely be running the new mardave chassis and wondered if you could run a 10th size servo or if it would have to be a 12th size? if a 12th is needed what are the better servo's on the market? im not after cheap and cheerful so some advice on the top end would be nice.

thanks in advance.