At this point can you really get a bad bike between a 2T like a YZ250, CR250R or a 4T WR450, KTM450XCW?
You will have fun on any of them but they are built for different types of riding.
The fact remains that there is not a DO ALL bike out there. You can get close but there just isnt. The closest would be the KTM300XCW.
I think you would be happier with something 4T that would be much easier on the road. In a perfect world you would own both types of bikes but money and wives usually puts a damper on that.
YZ250
Pros Cons
Fast Fast
Light Mix Oil
Nimble No light(can add)
FUN FUN Hard to make street legal
cheap to rebuild Wont be good on the street
Great in Sand Not as good in rough single track
Great in Desert Have to gear down to get more bottom end
Great top end NO ELECTRIC START
Not really geared for single track
WR450
Pros Cons
Fast Heavier
Dependable Expensive to rebuild if needed
No mixing gas Not as good in Sand(heavier)
easy to plate Not as nimble(heavier)
easy to lug
easy on single track
FUN FUN
Great in Desert
Great in AF Canyon
Headlight
Don't need to gear down
ELECTRIC START
I grew up riding bike 2T's. I love them but they have no place in my life right now. The Katoom 300's are bad ass. There is no doubt why they are so popular. They flat work, no doubt about it. The only draw back is Street-ability. If you are going from trail to trail then they work. If you want to cruise them around, no. The stink factor of a 2T is higher too. If you want to ride it to work 5 miles away, you will stink more than if you ride a 4T.
Why a 4T that comes from the factory with a headlight? Easier to ride on the road. Does that mean I would ride one from Kaysville to Provo? Never, they aren't made for that. They are wound up too tight to ride that far. People do it but not me. Yes they are heavier, a KTM300XCW similarly equipped comes in at around 245 lbs wet. A WR450 270lbs wet, KTM450XCW 260lbs wet. The difference really is the rotating mass.
The one reason I would get the WR over the others is dependability. They are proven to be better in that aspect. You can read article after article in all the Dirt Bike magazines. Honda has a single cam which is nicer if you do have to rebuild. KTMs have really stolen the market. They are lighter and better out of the box with better brakes and hydraulic clutches but they are typically a grand more. The problem with the KTM is the motor wears out faster. I know I will get arguments here but they do. I ride with a lot of guys that have KTMs and I ride more than them and they are on their 1st or 2nd rebuild. I have yet to have to do anything to mine but I did shim my valves once but only because I put in a YZF exhaust cam. My WR runs great and I know I can go out in the garage and push that magic button and it will run great.
This really boils down to personal preference. I like the WR but if I did get a 2T it would be the KTM300XCW. If I got a YZ250, I would put a big bore kit in it but it really isn't geared for my riding style but neither is a YZ450 or CRF450R or any of the other track bikes. You could put a Rekluse in them and that would cure that but it still doesn't have a E Start.
My suggestion to you is to come up to my house, arrange a time with Cheston and you can take my WR up on the mountain above Kaysville for an hour. He knows the way. Cant do it Friday through Saturday this week because we are heading south to ride one more time before my son goes into the MTC but after or before that you are welcome to come take it.