I just got three months of HBO for FREE!

Then you're in for a treat.  As a Seinfeld fan, you'll love Curb Your Enthusiasm.

Just a heads up, the early seasons are kind of raw.  Curb fans will hate me for saying this, but you might want to start with Season 8, just to ger your feet wet, as those episodes are perfected.  Then once you get into the show, you can appreciate those older seasons more.