Again, you should go for whatever period catches your interest. I would completely agree with the morphability factor, espescially when you are starting out. There is nothing worse IMHO then having enthusiasm for a particular army which doesn't live up to expectation in reality. From my own personal...

Thank you for replying guys, I will answer as quickly as I can

...new(ish) to FOG and currently building an Early Successor army. Would like to contact any FOG players in the Bristol (UK) for possible future games.