One thing to remember is... And Sky dont tell you this, Is you still pay line rental to BT for the phone line, also you will find that BT Option one (basic line rental) you can haggle with BT for free evening and weekend calls, also with your calls from and by BT you get 0845 numbers free now too. Im with BT but have been since dial up days, I dont have any bother with they, yes they do cost a couple of quid more to start with but you can Haggle it down, I have option one line rentel and option 1 broadband, up to 8 mb and 10gig down load limit and it all in costs me ?24.50.
For a normal broadband user 10Gig is massive, I used to online game too and never went over 10gig a month!!