Can't believe I forgot to mention Actraiser! I love the soundtrack for that game. Yuzo strikes again. Also, I have to second Joe and Mac. Especially like that "Waterfall Cliffs" tune.
Thanks for all the recommendations! I've started to check out the various OSTs Racketeers have listed. Really enjoyed the Verytex soundtrack. I've heard some Sakimoto stuff from a few Genesis games but need to listen to the others I've missed.