I think you're in the ball park. Some people may want a snorkel, but for me it would reduce the price of the machine. As long as the wooden seat can be removed and caused no damage then that's no big deal.
Without seeing pictures it's hard to say, but you can assume if it's got a snorkel then it's been in mud/water.
I sold a 2004 in really nice condition this spring for $3000, but it was in really clean condition, and I had purchased it for $2600 last fall.
Post up some pictures if you can get them and lets have a look.
Here's the trade in value for a electric shift model in good condition:
The problems in America arenít from liberals or conservatives, democrats or republicans.
The problems are bigots, hate mongers, fear peddlers and opportunists. History has shown that those people are far more dangerous than a few guys who talk differently or wear funny hats.