I've played Symphonia, Dawn of the New World, Abyss, Vesperia, Radiant Mythology, Phantasia, Xillia, Graces f and Eternia (which I think is all of the ones released in EU territories currently...) and I think of all of them the one I enjoyed the most was actually Eternia, on the PSP. I find Meredy to be such a wonderfully endearing character, and whilst the combat system felt quite clunky on the PSP (a trait it shared with the two Star Ocean remakes) I had so much more fun exploring the world. Symphonia had the better plot, and a significantly better villain, but the experience was just much memorable on PSP.