so as i research and find a way to purchase my first rhino i'm wondering what you guys think of the different power offerings. i'm leaning toward the "get the biggest you can get" mentality.... but should i just discard the notion of getting a 450? anyone here have a 450 and wish they upgraded to a 660? i know a few people who think a new quad user should never get the most powerful engine available. . . but in the case of a rhino is it different?