How much will iPad cost me?

For Christssakes is no journalist from the UK who covered the launch of the iPad going to be able to take a guess how much it's going to cost to run this thing?
Apparently AT&T in America will have $29 a month plans for unlimited 3G (as well as wifi). Does this mean I will be paying O2 even more cash when it's launched in the UK.
More monthly bills on top of my iPhone? Dammmmmmmm

According to Engadget there will be no contract in the US. The deal with AT&T means people will be able to cancel at any time. Great. Cancel at any time, render it useless too.

Why can't it work with the iPhone we already have? A piece of kit many of us in the UK are paying £50 a month for the pleasure of using. Hook the new iPad up to it if we need 3G. That would be a good thing, no?