Thanks for all the replies guys some really helpful stuff there.
To clear everything up and maybe help you pick the best one for me:
1) My phone contract only gives 1GB data a month, and I use that on my phone so tethering isn't really an option.
2) I won't be using many apps. Gmail, my IMAP mail, web browsing, typing stuff up on the move, editing Google Docs, and watching TV stuff like 4OD, Iplayer when I'm on Wifi.
3) No budget set - but I don't want a laptop/netbook and tablet. I want it to all in once, hence me liking the proper detachable keyboard that the Transformer has.
4) Things putting my off an Ipad2 - not a massive fan of Apple OS, everything else I have is all Google (mail, calendar, docs, phone etc...), connectivity.
5) Will be ordering in the next week or so - if it's not out now or in stock I can't/won't wait.
6) Really does have to have 3G - I need my emails on the go etc......
7) Bluetooth keyboard is perfectly fine.
8) Well aware of the apps available for Andriod as I have an Andriod phone and they are fine for my use.
I have a Samsung Galaxy S at the moment but I'll probably be getting the SGS2 in a bit if that's any help....?