If you want GP2 coverage, Setanta Ireland do a fair job of it. The commentators Declan Quigley and David Kennedy are adequate enough, but nothing you can't live with. The coverage includes live sprint race on Sunday morning and feature race on the Saturday. Feature is sometimes live, but not all the time, usually 1 or 2 hours afterwards I think. One bad thing about Setanta's coverage is that they seldom interview the drivers (this is the same for F1) but I think it will just take time before they get to waltz around the paddock themselves. They're still a new channel to the motorsport scene.