Looking for a yuri, anyone is good as long as it's not hentai or too smutty, has a plot, and isnt a oneshot.

There aren't many long yuri series.
Try
Haru yo, Koi
Girlfriends (MORINAGA Milk)
HEN
Boku no Futatsu no Tsubasa
Kashimashi - Girl Meets Girl
Himegami
Kannazuki no Miko

You ciuld also check some scanalations groups that mostly do yuri.

I highly recommend Sasame Kikoto, although it's shoujo-ai and not yuri.

Sasameki Koto and Aoi Hana is ma top pick for yuri.
Grab the anime, also.

Others include:
Lesser known ones, or at least I think they are...

Chatting over Tea at the Amber Teahouse
PURE Marionation
The Miko's Words and the Witch's Incantations
Strawberry Shake

Groups you should definetly check out:
Lililicious
Tranquil Spring
Wings of Yuri
Dynasty Scans
Horobi no Michi

"Life is not complex.
We are complex.
Life is simple;
and the
Simple thing is the right thing."

-Oscar Wilde

Octave
Hanjuku Joshi

Both are smutty though, the second one more than the first one, the first one is a bit slow paced in life I guess but there are some good moments, the latter one is rather sweet..

One good source of checking most yuri-s out is daily_yuri community, you can get to even see american comics with yuri hints or the yuri bits of a mostly het manga..and best part, each post has a warning whether the pics are smutty or not..

[img]http://i221.photobucket.com/albums/dd199/vivharv/Gokusen-1.jpg[/img]