House ? Got a few Emmys, IIRC, so worth a look.
Prison Break ? Pitched as the new Lost.
I've been watching House - medical drama, one patient with unheard of illness per episode - since the first episode, excellent show, Peter Lawrie is excellent
Prison Break, they've only made 13 episodes - already well viewed in the US - and then they got the go ahead to finish season 1 and the okay for season 2, have watched most episodes and is a good show
The office US, seen them all, very very funny, the first series is very close to the UK version, the second series is all new stuff ( however dropped to a 1/2 hr slot )
I would highly recommend these 3 shows
Another excellent US show is the medical drama Greys Anatomy, am surprised it has not been pick up by an Irish station