I'd give it an A, nicely done.  Sounds very crisp and clear on my system.

Bring up the vox in the chorus...
 
really like the tune!!!

Agree with all Rimshot posted.
I think the vocal is great and has a real uniqueness, (which is why we all want to hear more of it).
There is a chord near the end that sounds like it has a few out of key notes in it, I love that stuff.

You've gotten good advice from several people.  I think the song and arrangement is terrific!  This has both commercial and artistic appeal.  Congratulations  on a job well done! 

I like it.

Haha, thanks to all, I'm really glad you guys like this one, and thanks a lot for the mixing tips! Like I said, I'll definitely be possibly refining this mix in the future for a single (but for now there's a DL link on the Soundcloud). He and I have a couple of more collaborative tunes like this lined up, hopefully we can eventually take it to the 'perfect' mix :D