Why don't you get an Yashica A TLR - http://www.flickr.com/photos/martinturner/4789719521/
I think you'd have to be an idiot to get a Rolliflex until you learnt a bit more. Not that a Rolli is more advanced than a Yashica; but the Yashica can be had for under £50 whereas a Rolli cannot. Buy a Yashica, try it out, if you like it then get a Rolli ... simple. Film and scanning will be your only cost, 120 film costs a couple of quid a film, get it developed for a couple of quid and buy a film scanner or pay to have scanned.
The one thing that will throw you off and probably put you off is composing a shot on a TLR; you have no idea how tricky it is!!!! Left = right, Up=down; you move left and you are actually moving right, the same with up and down. It takes a few minutes to compose a shot if you don't use it that often. I would advise using 400 speed film for it (or a Rolli) - you naturally over expose.
I thought you were going to lay low for a bit with the 'I want to buy' threads?
Film is around £2.50-3 so not too bad, if you can't develop it yourself though it works out as about £10-12 a roll... £14 for 12 shots is something that does make me baulk a little (that's without scanning).
How about getting a Mamiya C220/330? Cheap, pretty similar and a nice camera. I have one and love composing in it, it gets easy quickly (diagonal is still a pain!) and looking down at a plate rather than into a tiny viewfinder is beautiful. Unfortunately I've only been able to shoot two rolls of film though mine in a couple of months, time and cost (developing) is an issue for me.
