I wasn't riding back in the days of the big bore 2 stroke dirtbikes (not that they aren't around here and there now) but what can you do with all that power anyway ? I have an 07 YZ450F and it's nuts as it is. I bought it figuring I'd get bored with the 250f, but if I had to do it over I'd go with the smaller CC. It would mean more shifting at Croom, but you crack the throttle on that 450F in the woods and it instantly increases the pucker factor
I'm sure it's great on a track, but the 250 should be plenty for the tight woods.