I'm currently collecting Avengers, Avengers World, New Avengers and Mighty Avengers. Probably going to drop the first two (maybe three). Mighty Avengers is the only one I'm current on - the rest have two or three issues sitting unread on my bedside table, which is a very bad sign. If it's not capturing my interest...

As for Mighty - it has the optimism that I remember/miss from the pre-Bendis days. It's a fun title full of heroes being heroic. It actually pays attention to its less-famous cast (unlike the Bendis era Ronin, for example). It has Monica and Jen! I'd recommend it to anyone.