Yeah, it does get pretty expensive, unfortunately. My wallet quakes in fear every Wednesday when new comics come out.
Btw, I know you're kinda overloaded with titles, but I did want to mention two great manga titles, in case you have the extra cash...
First off,
The Kindaichi Case Files is great if you enjoy murder mysteries. It's about the grandson of a famous detective solving all kinds of murder cases. Each volume is a self enclosed case, so they're great to pick up one at a time. The series starts with "The Opera House Murders".
The other series I want to recommend is
Sgt. Frog. It's one of the most whacked out comedies ever. It's about a race of frog like aliens that are trying to invade Earth. They have to abort, but they leave their advance scouts behind. The leader, Sgt. Keroro is captured by a family, and starts living with them. It's really weird and really funny.
I hope you enjoy the titles you said you were going to look for. All three are excellent reads. Welcome to another money devouring habit...