First up theres alot of animes i could reccomend Bad and Good ones.
but heres a short list.

If yer into random slap stick comedy i could reccomend excel saga and puni puni poemi people however told me gintama is good for a slap stick i beg to differ since all eps sofar made me sleep

As for romance. there are alot of diffrent romance animes out there but Clannad tops them all if ya ask me.
It has the Romantic stuff..but also Serious moments and a butt loads of comedy balanced in a very nice manner.
It runs for 2 seasons and one movie so its reccomended to watch..

Then we have one piece. It's nice cept they do tend to drag out on battles but its fun too watch an enjoyable.

i would reccomend bleach and naruto...BUT...you know already if ya like it or not..for me it was just a pain with all those fillers.

And heres a new one i picked up K-ON! which is a cute femalish anime. It's nice..atleast from the first ep caught. a lil bit unique animation style.

Also lucky star is a good one..all the cutey things in a nicely half adultish humor kind of way.

speaking of cute....Chi's sweet new home is probally the cutest you will ever get.. the eps runs for about 3 mins each and ITS F-ING CUTE O_O

I also reccomend Neon Genesis evangelion. It made an nice impact on me with the physcological bit.

and lastley on this post ill reccomend Death note.. It's nice and unique perspective.

~End