Frankly all the Tales games after Symphonia have been pretty similar but I personally liked Symphonia more than Abyss. On the other hand I've played most of the Tales games and I'm kind of sick of the series now since they all pretty much have the same story and it's only good the first couple of times. I actually think that Legendia was a bit more interesting but the gameplay was pretty lousy.

For an RPG that's at least a little bit different I'd reccomend Ar Tonelico if you can track down a copy and are more interested in story and character interaction than gameplay. hmm thinking about it that game is almost the opposite type of rpg compared to Abyss so maybe you wouldn't be into it.