Fellas, thanks for the suggestions! Lotta great stuff in this thread. Was gone for a couple days after posting the question and forgot . Will def check out all mentioned here.

As far as xm,etc go, I rarely study in my room, already have a great mp3 (iAudio X5) player w/ ~28gb of music, don't want to spend money on another portable device / pay a monthly fee.

The current study music collection (a very small portion of my music, but looking to grow it) includes, among others:

Dave Koz- my fav jazz artist
Chris Botti
Dave Grusin
David Sanborn
Enya
Enigma
Kenny G...of course
etc

Oldies Jazz- miles davis, wes montomery, tony benett, etc
etc

African Chill- def contemp music
Bent- contemp
etc

got some classical too, but got sick of it..