Ok so you want a 450. Keep in mind they don't have torque like the big bores. Personally I have rode the yfz,trx, and the ltr. All were stock except the ltr, it had a "cherry bomb" adds 7hp. The yfz is geared really high, I stalled it twice in the begining. First gear is useless. Second gear on the yfz felt like first on my old 660 and so on. Also its a very small machine and im only 6' 200 pounds. The trx felt more comfortable and was alittle more snappy, its not geared quite so high and was more suitable for me in the turns. Now a trx with the hrc kit would be a better pick than the yfz, but the LTR was near perfect all around with the added 7hp. It has such a low stance due to the race tires 20's in the front and 18's in the rear and the 08 looks sick. Defianatley don't get a Kawi, seriously who rides a Kawi? Keep in mind KTM has a 450 & 525 (very nice quads) and Can-am put alot of technology into there 450, but I have yet had a chance to ride either one. Just my two cents. If I were you, I would take a weekend and go to all the dealerships and test ride all of them and then choose.