Symphonia is not worth purchasing a new/used PS3. Not by a long shot.
If you're going to bother, find a dirt cheap gamecube and a used copy from gamestop and just play it that way.
It was a decent game, but it's not really super innovative. It becomes incredibly predictable at around the halfway point, which is also where the characters sort of stop developing. And I didn't find the characters all that interesting. Some had potential, but it just doesn't get used enough. And, unfortunately, looking at the character line-up now, they're are party characters I don't even remember anything about.
Basically, the first half of the game is fun (though sometimes absurdly difficult for no reason). The second half of the game isn't.
It'll be close, but Romney has the momentum.