I have to say that I have soloed two blasters through Praetoria. One was a Fire/Energy and the second an Arch/Energy. Both played through quite well and had little trouble with survivability, but the archery toon actually fared better. Although I will say it was my third attempt at and archery blaster and I had learned quite a bit about how to play one.
I do say that the most important thing is to have fun though, so roll what you think is fun. As always YMV.