I'd wait. It should be coming soon. When 2.2 is actually released for the Captivate, you're either going to have not only a safer upgrade path, but if you're dead-set on going down the one-way street of hacking up your phone you'll find more-compatible 2.2 ROMs released based upon the official 2.2 release so they'll have less issues, bugs and quirks than the hacked-up versions floating around now.