November 01, 2010
I'd vote for Park City due to the ease of travel for everyone and the good night life for a bachelor party... but really any of those options will be a blast!!
Don't forget about the Canyons just down the hill a bit from Park City. Sick houses with ski in/out. But price tags to go with it. Check this one!! http://www.vrbo.com/322801 Problem with going to Canyons is that you'll need cars to shuttle everyone only adding to the overall cost (but all the places you mentioned will have the transportation issue)
Here's one with a walk to downtown Park City http://www.vrbo.com/54094 but the 7 night min might be an issue. Dude... this sounds fun... i want to keep planning!!!