Absolutely delighted with all the replies guys, many thanks. As it is I think I’ll go with a 350 4 stroke of some description. From the small amount of personal experience I have with 2T and the replies here, I think the 2t might have the edge for capability but realistically it’s extra bandwidth will be outside of my talents anyway and 4 stroke i think will be an easier time to begin with. And I’m old and lazy now. Last week there was a Beta 350 at the dealer recommend above, which looked ideal. I’ve ridden with the these in the past and I know them to be excellent. My only reservation is that I have a Tundra in inferno (colour) which is a bright burnt orange and my OCD streak won’t allow me to put a red bike on an orange truck So now keeping an eye out for a KTM350 EXCF or similar. Thanks again all for the advice, I’ll update this thread once I get something bought and I’m keen to hear from anyone who rides regularly in CO, I’m in Erie but I’ll travel.