Hold off on that. The recent PR update has seen A LOT of sites go up in PR. This leads me to believe that the increase has been numerical only, but the value increase, relative to other sites, isn't there. So the next few days you'll see every noob and their mother trying to sell links on their newly-updated PR5 site for some quick cash. Just watch out for what prices you pay, 'cause you're likely to buy links on what only yesterday was a PR0 site. So give it a few weeks until all noobs come out of the woodwork and sell their links, and the market and the prices will level off.