the office is my favorite comedy show

Seinfield is American tosh; Curb was infinitely more amusing and, thankfully, less 80s.

My votes would go for:

The Office
Big Train
Blackadder
Curb Your Enthusiasm
Arrested Development

And that's just for starters...

Peep Show is superb, can't wait for the sixth series starting this month!

This might sound cliche but the best comedy series ever has got to be Seinfeld. It's been quite a few years since it ran but it still makes me laugh.