tuckers 20;
I had an 02 drz250 and chose it over the xr250, i think, because the drz had electric start. I'm sure both are good bikes, BUT they don't make the xr250 anymore so that may drastically affect resale??? I don't know.
I'm sure there are a LOT more after market products for the xr. There's a company or website, "xr's only" or something like that! Google it!
These bikes are not good for mx but you probably already know that, at least not for very high jumping.
As far as topend/bottom end, to me the 4 strokes have pretty even power thru the rpm range, but I will say when you get the revs up high on that drz it flies! That's where it feels like the most power kicks in. I noticed the same thing on my Yamaha yz250f, which is a better bike if you want to ride trails AND get up in the air too-
Good luck!