LTR! Actually, it depends. If you ride tight trails, it's a wide ride from the factory. Any other type of riding though is no prob with it, I use mine for both track and trails. Handling is superb in stock form, the stability of the LTR alone will make you a better rider. Are you buying new? If not, '06-'07 do not have the 3rd gear prob like the newer ones do. If you are buying new, like stated abone, ATP make's a billet 3rd gear.
If you plan on modding in any way, even just pipe/intake, don't even look at dirtwheels reviews on power/speed. Any of the 450's opened up to breath you would be happy with. Stock for stock, the LTR is by far the cheapest to make go fast. The honda is pretty bottled up stock, but can become a monster with some work. The YFZ's I can't comment on too much, never rode one, but around my area, everyone and there brother has one. The Kawi is nice in that it has reverse, but falls in the middle of the pack for power.