Mobile broadband for online gaming

Ok im hoping to move back to our flat for a month, but since we have disconnected the BT line and internet i will be using mobile broadband.
no worries i have a 3 dongle but i want to use it for online gaming with my wii and ps3.
which network should i go for and how much data?
natrually its all pay as u go but i dont be spending over the odds.
i was thinking about the vodafone broadband plus but not sure if its worth the money and if i could then use it for normal mobile broadband if i dont want to top up by