Need A Bike

Hey, guys I am pretty new to the forums as you can tell from my post count, but I hope to get my knowledge of motorcoss up from this forum. The Problem is I dont know what to get. I am 19years 6,1 in height and have a weight of 215lbs. I have riden bikes before but I lived in Poland for awhile and rode supermoto I had a KTM 525EXC so fixing my bike or repairin wont be a problem. I live in London, Ontario Canada right now and I have all kinds of dealers around me, so brand is not a problem, the problem is what to get. I was looking towards a Yamaha but I have only riden KTM and want something new... Also I wanna use the bike to ride around say In a field kinda trails and then ok weekend do some motorcross. Any Idea
Cheers Mike