I was keeping up with the TPB's for the Avengers since the relaunch after Avengers: Dissassembled, but the team split so many ways after Siege that I can't keep up anymore. I was also doing the same with the Iron Man TPB's as well, but lately money has been tight, and my local comic book shops - I like to buy from bricks-and-mortar stores to keep them in business - hasn't had any in stock, either.
Other than that, I've also been collecting and reading IDW's Transformers: More Than Meets The Eye series. Mostly because it was a good jumping-on point, and I also love the art, as well as the amazing characterization and story-writing. There are genuinely heart-wrenching moments in there for some characters, and every single one of the characters has quirks, layers and personality out the yin-yang.
Which is brilliant, considering they're all robots.