Deepandsteep,
If you stay on the Saratoga side of the mountain the only Rentals are at the Saratoga Spa, they keep their sleds at Ryan Park and at least last year they were all Ski Doos of indeterminate age. All decent machines but not nearly as capable as most of today's machines. As far as lodging on that side Saratoga Resort and Spa is very nice but you have to drive 20 miles to their sleds. Ten Mile (cabins)and Rendezvous Lodge are at the base of the hill and next to the Spa's sled rental station.
Albany Lodge is on the other side of the mountain and has lodging and brand new M 8000's but they seem to be hard to get into until late in the season and the great off trail most years is a 20 mile trail ride away. I have never stayed in Centennial or rented from Snowy Range Tours but I do have some friends that have and they are a very good outfit with nice machines also, just make sure you ate your wheaties if your going to wrestle a 4 smoke.