Silver Star Story is great, but Eternal Blue is basically the same but better in every way. It's also DAMN hard, which is rare for RPGs. The epilogue is one of the hardest things I've ever done in an RPG, except for maybe some of the Ys games. If you can find a copy of SSSC or EBC, you should get them. Lucky for me I found a copy of both for 20 bucks each, but you probably won't get that lucky.

...and don't play Lunar Legend. It's TERRIBLE. And lastly, there's a new Lunar on the way for the DS, which is awesome. There was also a poll taken recently on Lunar-Net for the subtitle of the new Lunar, but it's over so...yeah, you missed out.