500
if you want one bike, just get a 500 ktm, it sounds like thats what you want anyway. ive ridden uncorked wr's, had an st on a yz, ridden and ridden with 450 sx's, and i like my 500 xcw just fine, it will go anywhere a 450 sx will (in my experience) it may lack a little snap, but exhaust makes a big difference. ive got an lt on my 500 and i weigh about 170lbs so that makes it go good too, i can pull just about anything in 3rd, 4th if its not super deep. one bike to do it all the 500 cant be beat.
if you want one bike, just get a 500 ktm, it sounds like thats what you want anyway. ive ridden uncorked wr's, had an st on a yz, ridden and ridden with 450 sx's, and i like my 500 xcw just fine, it will go anywhere a 450 sx will (in my experience) it may lack a little snap, but exhaust makes a big difference. ive got an lt on my 500 and i weigh about 170lbs so that makes it go good too, i can pull just about anything in 3rd, 4th if its not super deep. one bike to do it all the 500 cant be beat.