Ah yes, turn based RPGs... well there are the obvious ones like Chrono Trigger (one of the best RPGs of all time IMO) and Final Fantasy II/III for the SNES, but you should also try Lunar 1 & 2 and Shining Force CD (an SRPG admittedly, but still amazing) for the Sega CD, via Picodrive of course. If you don't mind action-based RPGs then Ys I & II for the TGCD via Temper is one of the finest action RPGs ever created. Lastly, Golden Sun for the GBA is pretty decent too.