I have a 2000 SS 550. Great sled overall for what it is, base model but good ride, ok power for a fan, not impressed with top end, but great bottem end. I cant really tell you to much about the sled because last winter befor the season started i bought a XC 700, and now i just picked up my new pro X 600. If you have nay questions fell free to ask.
Fan cooled will never stay with a liquid, I'd bump up to an Indy 500 liquid, or 500 XC which is what I have, but that's me.
That being said...if you are not an aggressive rider and do not need to stay with 6 & 700's then the 550 fan should be OK...my brother-in-law has an Indy Trail (440 fan) and he loves it, but he's wide open all the time to stay with me on the lake, but in the trials it doesn't matter, we are on equal footing there.
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