[S.J.SLEEPER]

out of all the brands..... Suzuki has the best oiling system and has less engine failures & problems,
Suzuki:best oiling system,most desired stunt bike,parts availabilit great, no common problems that I know of.
Kawasaki: noisy valves, swingarm issues,oe parts availibilty isn't the best
Yamaha: strong running bikes, very very light in the front, proven deltabox,have seen many motors blown though
Honda: all round excellant bike, reliable,some models a lil heavier than they should be

IMO (I used to own a motorcycle shop) I would buy a Honda or a Suzuki.

when you been selling and repairing bikes for 10yrs you tend to see which bikes are always breaking down and which ones you rarely see.

Good Luck w/ your purchase.

p.s. I have stil have some friends in the business that I could call if you would like to buy a brand new bike. let me know, I could get you a sweet deal.