Just completed Xanadu 2 and Spriggan 1, both highly recommended!
Xanadu 2 really needs that english patch so I can understand the story but it plays great regardless, although Dark Fact's guide really helped. This game has some of the best graphics I've seen out of a Turbo RPG, you can tell the developers really poured their heart into this one. There is a ton of extra detail and the cinemas are top notch.
What can I say about Spriggan, holy smokes, incredible what Compile was able to achieve with the scant 64K of memory in the original CD unit. This game has non stop action with some impressive visuals and music that put many Super CD shooters to shame. You can easily finish this game in one sitting but provides plenty of challenge for my taste, especially the last level and boss.