ALWZ65,
You can have instant hit out of a CVT if you gear it for that and have the clutches set up right. I LIKE the CVT! How I have my FL800 set up is great, but it lacks on the top end because I have it set for low end out of the hole/wheelies and the only time I want to go over 70MPH (where mine is at is now), is when a bike/quad/sand rail can pull another gear and run me down on top end.
YouTube - Akpilot1's Channel
Your right bikes are much more plentiful as they are wrecked by young wipersnapers, but sleds are also driven by these same whipersnapers and you can find them through insurance auctions. This is where I got my Apex (originally for a buggy motor but fixed sled untill I need it) and Nytro motor for my current project. As far as power out of either of these motors the sky is the limit both do well under Turboing or Supercharging, plenty of Youtube videos of these sleds.
My personal opinion is CVT for small areas like woods, short course racing or just messing around, but if you want to go topspeed then go bike motor, busa or ZX14.
Wayne