I remember going through this a while back. I posted by findings here:-
http://www.cslregister.com/forum/showthread.php?t=9577
Indeed Sebring Grey is a very good match, and probably correct. Getting the correct level of matting is critical if you are trying to math to the existing trims.
I'd paint all trims in one go if I was you, as the factory paint tends to get a bit gunky after 15 years - so will mark eventually. Then if the matting level is slightly non-OEM, you will never notice.
I stripped everything myself, then got a local painter to spray them, was about 100 quid all in i think, but he did have to spend a lot of time paining sample cards before we decided on the colour.