Off hand and in no order, the most beautifully done ones for me:

Hoshi no Koe
Shin Angyo Onshi
Kami no Shizuku
Liar Game
Planetes
Fire Candy
Basilisk
Team Medical Dragon
Bartender
REAL

Would have wanted to include stuff like Bokurano and Bitter Virgin but guess those 10 are what really really made me go WOAH.

1- Until Death Do Us Part
2- Vagabond
3- Freesia
4- Monster
5- Onani Master Kurosawa
(must reads)
6- Parasite
7- Zetman
8- Berserk
9- Liar Game
10- Shut Hell

[img]http://img152.imageshack.us/img152/958/tatarramazanbobiler.gif[/img]

1. Narutaru
2. Battle Royale
3. Wings of Vendemiaire
4. Milk Closet
5. Bokurano
6. Bradherley's Coach
7. The Music of Marie
8. Hallucination from the Womb
9. Elfen Lied
10. Uzumaki

hmm...
1.Shin angyo onshi
2. Historie
3. Team Medical Dragon
4. XXXHoLic
5.Monster
6. 20th century boys
7.MPD Psycho
8.. Seizon Life
9. Hellsing
10. Cesare

Too many to remember

01 Berserk
02 Vagabond
03 Iryuu - Team Medical Dragon
04 Mugen no Juunin
05 Shin Angyo Onshi
06 Gantz
07 Otoyome-gatari
08 Nana to Kaoru
09 Genshiken
10 Battle Royale

Not in any particular order

Ongoing Series:
01 Historie
02 Iryuu - Team Medical Dragon
03 Gantz
04 Mugen no Juunin
05 Soil
06 Piano no Mori
07 Vagabond
08 Vinland Saga
09 Real
10 Until Death Do Us Part

Completed Series:
01 Planetes
02 20th Century Boys
03 Genshiken
04 Haruka na Machi e
05 Shin Angyo Onshi
06 Threads of Time
07 Blame!
08 Sanctuary
09 Seizon - Life
10 Undercurrent

List of will read/am reading/have read in alphabetic order:
Aoi no Yuuwaku
B.Reaction!
Baka to Boing
Black Lagoon
CAT
Choumukiryoku Sentai Japafive
Diadem
Emerald
Frogman
Gantz
Hotel
Katekin
Let's Lagoon
Mahoutsukai to Teishi no Futekisetsu na Kankei
My Girl (SAHARA Mizu)
Seiken no Katanakaji
Sensen Spike Hills
Shin Angyo Onshi
Sun-ken Rock
Tenjou Tenge
The Ravages of Time
Unbalanceﾗ2
VITA Sexualis
Wolf Guy - Ookami no Monshou
Zetman

I haven't read many seinen, so I only have one, but it's one of the best manga period.

Jiraishin

Went with 10. Mix of ongoing and completed, no particular order.
Berserk
The Ravages of Time
Vagabond
Historie
Hoshi no Samidare
Shin Angyo Onshi
Dance in the Vampire Bund
Vinland Saga
Kiseijuu
Blade of the Immortal

"It is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science."

man, you gotta kidding me. my main read is seinen, and i have a whole bunch to consider.

grammar mistake is intentional, grammar nazis need their entertainment.

top 10

1.Berserk
2.Monster
3.Hellsing
4.Black Lagoon
5.Vinland Saga
6.Blade of the Immortal
7.Sunabozu
8.20 Seiki Shounen
9.Mushishi
X.Elfen Lied

1. Yotsubato!
2. Real
3. Pluto
4. 20 Seiki Shounen
5. Vagabond
6. Kurosagi Shitai Takuhaibin
7. Detroit Metal City
8. Adolf ni Tsugu
9. Uzumaki
10. Otoyome-gatari

1. World Embryo
2. Alive! The final evolution
3. Excel Saga (mostly the anime tho
4. Otoyomegatari
5. Maison Ikkuko
6. Higurashi No Naku Koro Ni
7. Liar Game
8. Wolf's Rain (Tho the manga was very inferior to the anime)
9. Mermaid Saga
10. Yotsuba&

-Insert Funny Quote Here Plz-

1. Liar Game (definitely no.1!)
2. Dance in the Vampire Bund
3. Mushishi
4. Moyashimon
5. Otoyomegatari