Dude. You definatly should, I recommend all four strongly. Maybe with the exception of the Sixtoo albums where he's rapping, check for his instrumental stuff though.
I found all these artists through Audioscrobbler, it really is great! Hope I can listen to them soon, but will prolly be hard to find....
Sage Francis! He's my fav. Take a look the Non-Prophets too. I got Blockheads album, I like it alot. It's really chill. I haven't heard Sixtoo or Kent though.
Yer, Non-Prophets is really just Sage in a more traditional hip hop form, great beats from Joe Beats too.
Hmmm... Time Machine. They're really good. You should check out Longevity Crew.
Gwenmars is the best band EVER///
'Fuck the Dumb'....listen to the Grouch ASAP. Especially, you MUST check out the song 'Silly Puddy' with Zion I. Quite possibly one of the best hip-hop songs ever....