Not the direction I would go, but I do know a number of people who have run Harbor Freight winches with success. If you're only going to use a winch once in a rare while, it might be a cheap alternative.
HF 12,000lb winch normally $499.99, on sale for $399.99, with a coupon $299.99
http://www.harborfreight.com/12000-lb-O ... 010_c3214a
Not sure how long the sale price, and coupon price, are good for.
Herb