thoughts on money management strategy

We have one brokerage account that is still down about 25% from 2008 and 2012 performance is net up 5.6%. We have a mortgage on land in another state (6.5%) and will begin construction of our retirement home in 2013. Given the uncertainties in the market, would we not be better off cashing out that brokerage account and paying off the mortgage (six figures)? Essentially guaranteed 6.5% return vs. unknown. We own our current home outright so not an issue. We have significant other holdings in 401, IRA, bonds, etc. so the brokerage account is not a critical part of retirement portfolio, but would be helpful. I am not a money guy, but like to be debt free.