wow BT2500 is cheap... I wish it was satellite capable or I might pick one of those up.
saw this on that one site if you haven't seen it...
http://www.buygpsnow.com/Product/OnC...6800__955.aspx
BT audio is probably pretty high quality but those FM modulators really drag down CD quality quite a bit.. I think running a direct line from the unit is the best way to go if you have inputs on your stereo.