I've been the big 4-stroke route twice, so forget that. The 250F is another story. Its so easy to ride and go fast, and do it longer without getting tired. Eric, you don't race, and if I didn't, I'd be looking for maximum thrill factor. While I still love the GGs, I can't help but beleive that I can go faster on a slower bike. I'm closing in on 50 yrs old and I have to work harder just to keep the status quo, so maybe its time to step down in power. My best friend and good A rider who rides a KTM 520 may switch to a 125 this year, now thats a change!
The Yamaha is a good 250F. I did a lot of research including talking to Les who has had more than a few apart, and he agrees they they hold up very well with reasonable care. The guy I ride with with the '03 has had no issues and then valve clearance has not moved since new, thats 4 years. Personally I would do a cam chain, tensioner, and inspection every year, but a lot of guys don't. Maybe its because in the woods there not bouncing off the limiter all the time.
Anyway, I havn't bought it yet but its a leading contender. I want to ride the '07 completely uncorked and JD jetted first. I was absoloutely shocked at how light and snappy the bike felt, even with the soda straw exhaust insert. It felt lighter than my EC250.
'07 GGs (DEs) have yet to show up here.