If you're looking for good instrumental melodic type hip hop I'd suggest DJ Shadow's work to you. Both Entroducing and Preemptive Strike are very solid picks.
As far as just hip hop in general (complete with dj'ing and emceeing)
The Roots - all of their albums are great so it's hard to go with whatever you can find from them. Kind of an organic hip hop band, using real instruments (drums, keyboard, and bass guitar, sometimes horns. Also home to two great beatboxers Rahzel and Scratch who can make any type of crazy noise with their mouths. Think of the Fat Boys, but to the nth degree. Being a beatboxer myself I love it.)
I'll make some suggestions from west coast (i.e. Bay area california) artists because thats where I'm from and where I grew up and was the first music I was into before jazz and classical and rock.
Jurassic 5 - Try to find their original 9 song EP and then get their full length debut Quality Control. Both are fantastic. They have a more early old school hip hop sound that may interest you.
If you're looking for something more like spoken word poetry and something real "out there" and abstract, I'd suggest Anticon. It's not really a group or a crew; the best way to learn about them is to go the site
http://www.anticon.com
Look up music from the label Quannum. They were formerly known as Solesides but they recently changed the name. Very good combination of simple, solid hip hop production and off the wall type emceeing.
I'm going to go off the "underground" hip hop scene for a minute and suggest Jay Z's unplugged album. The reason for this is not for the lyrical quality of his songs but for the instrumental band back up he had for this mtv performance. He had the Roots with him and they made every one of his songs into magic. I suggest you at least download some of the songs to see what you think.
I have a trillion more suggestions for you but you can start with these and later tell me that I have converted you or tell me to shut up and stop with the dumb music recommendations. Either way I hope I helped. Peace.