Only 5? For what is arguably the best system ever? You sadist, this is going to be a real challenge. But I'll take a stab at it:
1. Final Fantasy 5
2. Shin Megami Tensei
3. Final Fantasy 6
4. Chrono Trigger
5. Crap... hmm... oh, wait! Brandish.
And I hated leaving things like FF4, SMRPG, Actraiser, Brain Lord, SMT2, etc, off... and I could go on for quite a while with this list...
-dunno001
-On a quest for the truly perfect game; I don't think it exists...