Please do not take this as my attempt to piss on your parade. I am most definitely NOT trying to be negative. However, the following information is well intended and honest. I do mean well here.......
Snowmobiles are NOT, in my opinion, a really good form of reliable transportation.
12 inches of snow overnight? Great. That makes a fantastic addition to groomed trails. However, many modern sleds don't do well in deep, ungroomed snow. There are deep powder sleds, wiht paddle tracks and longer tracks. A lot of the others have a tendency to sink like crazy in deep snow unless they are barrel-assing along at 50 mph+. I've dug, pulled, and lifted one too many sleds ou of deep snow to really have faith in their ability to run virgin snow without problems. You can either drive somewhat slower and sink into deep holes, or you can barrel ass along at 60 mph over virgin snow (until you hit an obstacle hidden under the snow or tear a friggin ski off). Niether work so well..
You want simplicity, reliability dependability and ease of starting? Do NOT look at pre 1990's sleds. Period. The general rule in one hour fixing for every hour riding... I'm not trying to be funny or piss on your post. I've simply sledded too long to have much faith in sleds.
Good gas mileage? OMG. Thats down right funny. Okay. Here goes: On groomed trails, driving relatively modestly, steady throttle, no driving like a demon, my sleds averaged about 12MPG. And thats premium fuel. Add a substantial quantity of two stroke oil too. This was for a modest 750 cc sled. My four strokes got about 22 mpg, which was considered GREAT mileage. That was when we were 'touring' (driving like two old ladies coming home from Church on a sunday afteroon on hard groomed, easy to drive trails). Get either of these off the groomed trails and gas mileage would plummet like a stone.
Under $1000? Sorry friend. THere are no sleds under $1000. Mine were running $8000+ when I first started buying them nearly a decade ago. They are now $10,000 and more. And used they sell for $4000 and more. Old pre '90 sleds have very old, outdated suspensions and parts. They are VERY uncomfortable and handle poorly compared to a more modern sled. The lifespan of a sled is SHORT. There are a LOT of 'consumable' parts on a sled. I did the math: Each of my sleds cost me $1000 per year before I ever even seen a snowflake. Basic insurance. Engine tune up. Drop the track and replace the track slides. Replace the carbides on the skiis. Replace the skiis themselves. Fix all the little parts that broke, wore out or crapped out each year and I had $1000 in each one before the season started. And these were "new" lower maintenance sleds (not some beat to death ten year old crapped out rust bucket I paid $1000 for). If you find a $1000 used sled, expect to spend another $1000 to make it kinda sorta basically useable. It will not be reliable. It will get you 21 miles out into the remote wilderness and then suddenly die unexpectedly leaving you to freeze to death.
Carbides: There are studs in the track, to provide ttraction on ice. A simple set of metal screw like objects, with corresponding washer and nut like thingies. One set of these babies, as parts (not installed) can easily run $200. The other carbides: Metal rods that act as wear bars and traction devices on bottom of skiis. Replaced once or twice each winter $75 a pair for cheap assed ones, good ones frequently $150 a pair.
There is no susch thing as suspension travel that is "too much". Trails are not roads. Trails get REALLY bumpy. A new sled have massive travel. And used all of it. An old sled has little travel. Reach behind your head until you can feel your neck. Feel those knobby thingies sort sticking up outta the skin? Vertabrae? That is your suspension on a pre 2000 sled...
There are a very very few selected 'work' sleds that are desgned for use on track lines and the like. They are common in northern Canada and Alaska. I think I've seen ONE in my entire life. Examples are Ski-doo's Skandic and Yamaha's Viking. These are rare in the lower 48. If you find one, it will not be for sale. It will be in the process of being worked to death. If it is for sale, it is a half step from death. And all other sleds are recreational toys, and very expensive ones at that.
I have a lot of toys. Boats. Motorcycles (a fleet of those actually). Snowmobiles. Cars. I think I've owned just about everything except an airplane. I can think of nothing mechanically that is as inherently expensive and unreliable as a snowmobile. I eventually sold mine a couple years ago, mostly because I could not stand the constant drain on my wallet. I once sat down and figured out teh true cost of sledding. The sled depreciation. Gas (This was when I was paying $2/gallon for premium). Oil. Insurance. Repairs. The actualy cost then was about $1.20 per mile. Two sleds running for a most 100-150 mile day meant $240-360 in expenses for the day. Add restaurants. Add a larger truck to tow em. Add add add. I enjoy sleds. We had a lot of fun. The are expensive.
There are cheap sleds. There are reliable sleds. However, there are NO cheap and reliable sleds.
Fro.