Gee, hope you don't sell your stocks at the bottom of the market. That might wipe out the difference in capital gains rates - if there even will be a difference, because we don't know what deal is going to be worked out yet. Selling now seems a little panicky, not to mention risky, unless you think you're going to need the money next year.
I presume op is going to sell and then buy it back, thereby locking his capital gains
Yes smart, pay transaction cost x 2, plus pay more for the same stocks as congress solves the cliff problem. All this on your gains on the stock.