h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Hi all, bit of help needed
I've got a fair few questions so bear with me...

I've been riding a moped for a year and a small 125cc VanVan for 6 months now. I'm looking to take a few lessons soon and get my test in.

I've been looking round at a few bikes and seeing as I'm going to be on this bike for quite a few years from now I want something with a bit of style and reliability. I'm after something sporty about 600cc size. I'm going to need to make some long rides on this bike, will any motorcylce do or what should I be looking for?

Are all motorbikes just as good for doing the job of taking a pillion passenger, or are there things to look out for that compromise the bikes safety with a pillion?

Can anyone give me some advice on what to look for? recommend me the best kind of bike?

Also what are the benefits to having a fully faired motorbike? Are all sports bikes fully faired?

Is backache something I just have to live with!?lol no techniques to avoid it??

cheers ben