I got the Honda 450ES. Top of the line for Hondas. Electric shift, full-time 4WD, digital speedo, etc.
I don't know enough about them to say it's the best of class, though. This one's an amazing workhorse, but it's not much as a "toy". I'm giving this one to my wife and getting myself a wild toy and getting my daughter a tamer one.
If you're gonna play aggressively on it a lot, I'd avoid anything that's full-time 4WD. You just can't make the thing lose traction to do a drift. And it doesn't wheelie very easily.