Have you considered/seen the new samsung omnia (or i900 as some call it) i dont know too much about it but it does look similar to the iphone, has 5mp cam, wifi, either 8 or 16gb memory and a large touchscreen. Thinks its released soooon Linky
BB7 all the way (cheap, reliable, powerfull and a doddle to set up) if you do decide on one don't forget to also order a lever (i have the SD7) and some cable
It's all down to personal preference really, I am a fan of street myself but if you like both you should continue to ride both (you'd probably progress more as a rider having the knowledge and experience being able to ride both) happy riding
Yes chainreaction is a website you can trust, but a MUCH better one is tartybikes.co.uk (it's based purely on trials ). If you give them a call i'm sure they'll be more than helpful and answer your questions.
Have you considered 24" ? i'm same height as you and LOVE my bike (pics on profile if you care?) but yeah as already mentioned you should ride all sizes then make a choice, happy choosing
Quite possibly the best looking 'black' inspired i've seen nice one mate. I'm also waiting for the seat to come out, read on dave's myspace he's hoping it will only be another two weeks now (fingers crossed)