As for which areas are better than others, I generally prefer Loveland to most others when it's just WROD. There are usually far fewer skiers, and the snow stays nicer.
I just checked and Loveland's early-season pricing is guaranteed through 11/23, so you wouldn't have to make any decisions earlier than you might want. The four-pack is $139 and transferrable, if you wanted to, for example, use two tickets and sell two. Or the pass card is probably better: buy the card for $47, it comes loaded with one day on it, then subsequent days are $42. http://www.skiloveland.com/ticketsandpasses/compare.aspx
I can also imagine that you might want to ski different areas each day, especially if terrain is limited. Looks like you can prepurchase ABasin tickets for $44 during that time. Copper doesn't have its rates up yet, but it will cost more for sure. Unless there is a ton of early snow, I would probably stick to Loveland or ABasin, maybe 1 day at Copper. I haven't been to Keystone early in a long time, so I have no advice there.
Just pray for a November like we had in 2010 ... this is from Chair 1 at Loveland on 11/16 that year.
And just a bit later at Vail...