Rebuilding the blown Oddy
Engine may not be so bad, really. If it's a top-end, it'll be $200-$250 for everything (bore/hone, piston kit, gaskets/seals).
Sled Engine is the simplest swap, preferably liquid-cooled (esp for Florida riding). Seems to be quite a few sled engines on evilBay. Or find one on CL in the snowbelt and see if they'd be interested in shipping for an extra few $'s. Look for Rotax 440-467-470-580-670 engines, since there is a decent amount of info out here about the swap. I'm not sure if the Arctic Cat EFI 500-600-700 2-cyl engines will work...there are a couple I eyeballed recently (for simplicity of EFI) for a next build. The F7's are pushing some really good power!
Only thing sucky about buying "an Engine" is that you can get screwed easily. If it's in a chassis and running, not only do you know it works, but you also have all the peripherals to make it run (carbs, fuel pump, wiring,
CDI (Capacitor Discharge Ignition)/ECU, intake, coils, etc). Sitting outside of the chassis and sight-unseen...it can be a total turd bomb.
The guys at Farr will charge you more because they did the leg work to find a good, solid Engine. Plus the shipping will be nasty. Heck, it's like $30 just to send some Engine mount plates from there to here in Toledo, OH!!! So I can't even imagine shipping 50+ lbs of Engine to Florida!! It's not them overcharging for s/h, its simply the cost of s/h from way up in Quebec.