the only things that seem supported in north america would be mcd and redcat. getting parts for an FG isnt that hard. there is fgsupply.com, largescalerc.com does have some stuff in stock. i myself just order parts for my fg from hobbythek in germany. generally takes 5-8 days to get and thre parts are cheaper. sure shipping is a little more (for me not so much, im in canada, shipping costs from the US are very close to what it is from germany) but once you figure what you save in parts it evens out.
if you want a gasser mt thats a little smaller, wait till hpi comes out with the 1/8 scale monster, im guessing its savage based. the savage is a great platform. or if you don't mind nitro, or even electric, there are 1/5 scale conversions for the savage platform.