I have built and flown several different bipes,but my favorite is the Skybolt ARF. It much lighter than the kit and the aerobatics are spot on. I fly mine with a Saito 100 and have no complaints about power. You need to keep a little power on during landing but it settles in nicely.
The firewall on the ARF is it's weak spot and highly recommend if you get one,reinforcing it, also take the time to lay a little fiberglass in the wheel pants,especially if you fly off grass.
My first bipe was a kit built GP Ultimate 40 with a Saito 72 and I admit,it was a handful for a first bipe and a little small,which made it harder to see.