I've been really busy with school and work lately and want to unwind with a new manga. I'm looking for a good series that is already pretty well established ( around 200 chapters or so ). I was thinking maybe something funny with more adult themes. Heard Futari Ecchi was good but I dunno. Here are a few titles that I have enjoyed to give you feel for the type of stuff I like:

Gantz
Berserk
Shaman King
Xxxholic
Negima
Get Backers
Gacha Gacha
School Rumble
Bleach
Naruto

Thanks in advance for your suggestions!