Recommend me some manga, please?

I have been meaning to catch up with and expand my mangá collection, and I wanted some options for the seguinte time I go out and buy some! ^_^
I have already read/seen as an animê (these are just my main favorites):
-Yotsuba&! (manga)
-Puella Magi Madoka Magica (manga/anime)
-Toradora! (anime)
-Five Centimeters Per segundo (manga)
-Azumanga Daioh (manga)
-Nichijou (anime)

I buy my mangá from my local Barnes and Noble (sometimes off the site, too) so if you know already that the store has it in stock, that would be helpful as well. Thanks for looking!