Here my two cents (I like short stories):
Yoshida Motoi, The Day Before Summer (solid plot, really good narrative, great 'conventional' art, but really really great)
Fuyukawa Tomoko, Nostradamus Love
Takahashi Hiroshi, QP (the classic shounen fight school of life but gooooood!)
Kui Ryoko, Seven Little Sons of the Dragon (Collection of shor stories, some of them are really profound)
All Kaoru Mori series, but the best to me is A Bride's Story, a seinen that portraies customs and ways of love of the C XIX Middle East. Some characters are adorable to death!)
The retired mafia fearsome guy retires and goes the house way, cooking labor. Gokushufudou: The Way of the House Husband is a really on going funny collection of stories based on the idea. The same idea was the plot line of Kubonouchi Eisaku, Chocolate, with the difference that in Chocolate there's real violence and drama mixed with comedy and gooood romance.
Feng Shen Ji a manhua with solid plot, a really good MC, full colored series with nice 'realistic' art.
On the manhwa side, You In-Wan Shin Angio Onshi and Ha Il-Kwon, Annarasumanara
Tsuhara Yamusi, Five Color Boat (superb story, odd art stye)
Okadu Tatsuya, Doll (on the pervy-comedy corner)
Yamakawa Naoto, One More Cup of Coffee is a collection of stories about… coffee. Odd magnificent art style and really nice relaxed read.
Also around Coffee, Ashinano Hitoshi, Yokohama Shopping Blog (if you like Zen and spiritual themes you can have a nice trip here)
… And the best of the best of the best would be Satoshi's Sengoku Youko.
Not reading much manga nowadays here but you remind me I have a debt with Takemitsu Samurai.