I personally wouldn't bother with socket 1366, you are really limiting yourself there.
An AM3+ board with say a Phenom X6 would be nice. The 1055T is difficult to overclock in that it's locked, so you'll need a board that can handle high bus speeds and also decent RAM to sustain it.
The FX-6100 is pants, I have had both the FX-6100 and a 1045T and I can say the 1045T at stock is faster than the FX-6100 at stock by a big margin.
Overclocked 1055T > FX-6100 easily.
FX-8320/8350 would be a more viable choice here.
The Gigabyte GA-970A-U3DP is a popular choice and will handle a Phenom easily. The FX-8320-8350 is a bit more taxing on the board (hence the higher phases).
Bottom line, I can say a Thuban is an absolute joy to overclock and you really do feel the benefits
from experience you really need to juice the FX-6100 high to reap the benefit.
FX-6300 is a different story however.