Out of the Marvel titles you mentioned, I will still collect Daredevil, Amazing Spider-Man and Captain America but Fantastic Four is a title I dropped a few months ago. In regards to DC, I was just collecting Justice League of America, Justice League International and Dark Knight Batman but decided to drop those titles as well. I bet the other DC titles you mention are great but I would just go overboard if I got more into DC.
I currently collect the Avengers titles, X-Men titles, Hulk, Venom, Thunderbolts and Scarlet Spider but may end up dropping some of those as well. I am really enjoying the Venom series right now with the current Savage Six storyline because what they are doing with the villains in that group. The problem too is that I am a sucker for those Marvel events including the Avengers vs X-Men titles. Last comic book Wednesday, I spent around $50 and that is getting way too expensive so that is why I need to do the purge.
I truly had an amazing time at SDCC and I took a bunch of pictures of just people in their amazing costumes!! I applaud everyone that goes out to these conventions and represent in their cosplay costumes!! It shows their creativity, dedication, love and passion for comics, anime and anything pop culture!