I raced motocross for a few years in my younger days, and all the bikes then were two stoke. I've been looking at 450s and larger from various manufacturers. I even found Service Honda, and their "new" CR500. I like two strokes for simplicity, and I'm familiar with them. I'll probably do mostly desert/trail/mountain trail riding. I posed this question in the 450 forum, and most said the 450 is better (between the 450 and the 500). However, while looking at a CRF450X a few days ago, I saw the 650 model nearby. I'd never thought about owning one, but it looked to be a bit more durable than the 450 (motor wise). The salesman said, "You don't want that, it's a pig." I noticed on this forum that they're referred to as pigs as well. So, it weighs more, but is it fun to ride in the desert? Does the motor hold up better than the high-reving 450s? Is it that much more of a burden to ride than the lighter and narrower bikes? Does the 650 hold up better under larger riders (I'm 6'2", and 220lbs without riding equipment added). I've also found a site that mentioned a new 500 or 600 XR in the future. So, bottom line, I'm looking for a little advice. For recreational riding for a guy my size, how does the 650 stack up? I'm sure there are many other factors I'm not aware of enough to even consider or ask about...so...thanks for your responses.