It all depends on what I'm looking for when I'm posting.
WSB, Big Nick, Punqsux are all usually good for a laugh.
Camoor,JMCC, and zionoverfire are usually good for polite arguments.
Epobirs, Mightyslacker and defender are often really good for content, each usually raising the intelligence of a thread by a couple points.
shrike4242,CheapyD, D4rkewolfe, Neko Hime, DarkeKatt and Moxio are all around good people, so I always look for thier posts.
Nintendo Fangirl and Minx usually have something interesting to say, so I check for thier posts.
Our esteemed mods usually have some good stuff in thier posts, so bluetoast, Ryback, the Seal, and Penguin and all of the mods have me check whatever threads they're in.
The Michigan CAGs have me doublechecking for the local deals.
Mr.Anderson, deadzone and morbid all seem to be fountains of teen agnst, so they're fun to read, if even only for a chuckle.
Scorch is often good for a read... I know he usually is dead set against my post most of the time, but I can tell from the rest of his posts that he's usually a decent guy, so I at least look at what he's saying.
Of course, Dcfox is a good read, if I don't mind emptying the contents of my stomach after reading his posts.
I know there are lots of other CAGs that I check thier posts constantly, but I'm pretty sure that all of you don't want to read a 2-3 page documentation of what I enjoy about each and every CAG that posts.