The wyeth-Scott looks nice with the doubled back cable. It looks like you could buy a 1-ton come-a-long for $20 bucks at Home Depot. The one listed below is under ten pounds, but it's only 12 feet long. You'd probably need to use some kind of static rope or tow strap depending on how far away the object is. It's a much cheaper option than a static rope and pulley system.
I would also create some factor of safety and redundant system depending on safety and what the value of the lifted object. Lifting a 900 pound object with a 1-ton winch could end disastrously for the object or anyone underneath it if something went wrong.
http://www.homedepot.com/webapp/wcs/...ocStoreNum=629
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