good choice. i just wanted to make it clear here that the WR is no play bike. many peolpe believe that the WR is a 'trail bike', whereas the YZF is a 'race bike'. The WR is a YZF modified for enduro competition. all the changes made by Yamaha are there to make the bike more competent (faster) in its main area. Enduro competition. they wouldn't go to the trouble to make it slower.
My WR is heavily modified. it is a YZF, with the exception of a few things. The main things are : 18" rim (enduro remember, see post on 18" vs 19" rim), extra core in radiator (good again for enduro), and the terrific WR gear box. If i had a YZF, this is the thing i would miss most.
Lucky for me, Australian WR's come with a YZ seat/tank. i believe this should be used on all WR models, as it is so much better. you wouldn't go back to the big one after the YZ tank, that's for sure. If the WRs here didn't have the YZ tank, i wouldn't have bought one. Replacement YZ seat/tank is AUS$800!!!
So if you have the WR with the YZ tank/seat, all you need to do is the free mods. They take time, but you will learn more about your machine. go to the trouble of changing to YZ timing, and do the air cut valve mod. This will turn you WR into a snapping wheel spinner! but i admit WR timing is better for tough hill climbs.
So thats what i wanted to say. Tell us when you receive your bike, as there are a few things you should do first up before you ride it.