Video Girl Ai Fantasy, comedy and some romance too.
Gunslinger Girl Even though not finished, it is still a great thought provoking sci fi/action series.
School Rumble & Azumanga Daioh Both are funny high school mangas. If you aren't afraid of something in more mature humor, High School Girls & Pretty Face are hilarious.
Maison Ikkoku is classic Rumiko Takahashi, very funny and satisfiying.
Claymore is one of the best in fantasy. Not for the squeamish.
Battle Angel Alita & B.A.A. Last Order really good sci fi adventure.
Midori Days is one of the funniest mangas I've read.
Oh! My Goddess There is a reason this has been one of the most loved series in Japan for over 20 years. Funny and creative. It's nice to have story a where the main characters stay true to themselves. Keiichi and Belldandy's relationship will always be the one constant in the universe.
Gunsmith Cats Lots of action both with cars and guns. Expertly drawn and technically accurate. Some adult subject matter.

keep them coming leaning towards bleach at the moment

One thing to keep in mind with Bleach is that it is a long (and still being produced) series to get into. Currently 27 volumes have been released in English (with a new one about every 2 months) and I think they are up to something like volume 38 in Japan.

Your best bet (financially speaking) is to grab the Bleach Graphic Novel box set (available here: http://www.rightstuf.com/cgi-bin/catalogmgr/NRKNRir5e4bjUrbaVf/browse/item/80300/4/0/0 ) which includes volumes 1-21 in a cool box (makes me wish I didn't get them individually actually.) Since it is a decent investment though (even if it saves money over buying individually in the long run) you may want to see if a local library may have the first few volumes available, or head out to a bookstore and read a little bit of the first volume to see if you like it. That way, if you don't, you won't feel like you wasted a bunch of money.

I'll second Claymore as well. It's actually a Dark Fantasy title and it's in my top 5 at number one.

Sci-fi: you can't beat some of the classics like Akira and Ghost in the Shell. Blame is a good read, considering it is a like a silent movie, the world is so unique, it is a must have for sci-fi fans.
Fantasy: It's like every other book on the shelf. That's the US market right there. I agree Claymore is one of the best. Depending on your definition of what fantasy genre is, you can easily put Death Note, Naruto, Bleach in fantasy category. Try Mushishi, if you don't like violence with your fantasy.
Action: I recently picked up Jack Frost by Yen Press and it is quite good, action wise. But if you are old enough for brutal violence, try Blade of the Immortal (warning: it makes everything else like a roller coaster ride in grandma's house... whatever that means!). Bleach and Naruto is definitely up in this category for sure.
Comedy: I have been reading Welcome to the NHK. Again, that's pretty older teen. If you like Japanese humor, you must read Sayonara Zetsubou-Sensei. I like the anime better.

i would like to thank you all for your suggestions and feedback. i have decided to go with "bleach" and "no need for tenchi" series. thanks

For comedy I suggest Azumanga Daioh and Yotsuba! (both are from the same author). Sci-fi/comedy I would suggest The Melancholy of Haruhi Suzumiya.

Hope that helps, if I can think of some more, I will let you know

thanks adeeee