Choosing mobile broadband deal

[Djinn]

I am currently living in an area where ADSL lines cannot provide required speeds so I have two options to choose - mobile or wireless broadband service.

My neighbour uses T-mobile and says he gets speeds around 850Kbps and the coverage of the provider in my area is good. So, I browsed through all T-mobile broadband offers and some of them also come with free dongle or laptop. However, the problem is whether to choose monthly option or pay per day option.

Does anyone have suggestions for me?

Thanks,