Yes, buy a WR450.
Somebody said that the WR450 felt heavy... Perhaps they've never ridden a DRZ400! MXJunky just bought a WR450 after a couple of years on a DRZ, it was like going from a fat chick (not that there is anything wrong with fat chicks) to a super model.
Edit: Rush kicks ass! "...things I know, things I wonder, things I'd like to say..."
I never rode a drz400, but I went from an xr400 to a wr450...(and that fat chic thing you said). Ya know what I mean?
And yes, Rush DOES kick azz.
Wave after wave will flow with the tide, and bury the world as it does.
Tide after tide will flow and recede leaving life to go on as it was.