This is a bad time to upgrade, with conroe less than 7 weeks away (July 23rd). The $315 E6600 is faster than an FX-62 at everything, and at a fraction of the price!
http://www.hexus.net/content/item.php?item=5692
Even if you don't want to go Intel, the price of current AMD chips will drop considerably so it's worth waiting a little longer.