ProWrench, those are nice sleds! I've been thinking this might be the best sled for my GF to ride... She's 5'4", about 115 lbs, and a fullsize sled is a lot for her to muscle around. With her onboard, I would think a 550f would be plenty of power! I had a 570 Mtn Cat several years ago, and it did pretty good with 160lbs of me on it, and it was probably 100lbs heavier!
If you can't find someone to buy one this year, don't sweat it... I promise I'll buy one next year!
(Gotta save for a house right now...)
Chris