I have to agree that I would strongly recommend not unrooting your phone. There will soon be no way to get root back. Yes there are some bugs in the GB releases but that is because they are just test versions of the software.
I would strongly recommend trying out Das BAMF 1.8.6 with one of the newer radios, such as 627. This is a rock solid froyo ROM with some nice extra features added. I put it on a friends phone and she loves it and has had zero reboots.