I've recently started using shopto, for my games. I have been amazed by the reliability, of their service, I ordered a game at around half four, and they stuck to their delivery promise.
I also preordered halo 4 with them, and they dispatched in on a SATURDAY. something most, companies would never even consider! I got the game, early monday afternoon, a day before the street release!
They are now my first port of call for games, not only due to delivery, but also due to their pricing.
Fantastic company, will definitely use in the future!