im lookin at gettin another atv. i am goin with the grizzly model. my problem is i dont know if i wanna get the 450 or 550. im not lookin for anything too big or to go play in deep mud or water, just to ride and play around. not gonna put no bigger than a 27" tire, prolly 26" is what will go on. the 550 has FI which is nice, but dont know if i wanna spend the extra for it. is FI that much better to spend the extra 900 for it?