Are these games even good anymore? I feel like there's a million of them and they all look the same. I stopped playing Tales after Eternia on PS1.
First off they're one of the few big JRPG series that survived post-PS2 (Breath of Fire, gone, Mana series, gone, SaGa, gone, Suikoden, almost gone, Wild Arms, bye-bye, etc.).
Tales of the Abyss has one of the best videogame storylines I've seen (it's "very complete" at the very least; someone back this up they want), and certainly one of the best in the series (I speak for myself, but I'm sure many agree it's at least a highlight of the series).
Tales of Graces sports on the most fun battle systems in real-time RPGs. Unfortuantely lacks that awesome storyline that's anything more than predictable. You'll put a LOT of time into this one for everything, literally, everything else in it though.
Vesperia provides a great atmosphere, better-than-average combat, and a big beautiful world with lotsa sidequests (especially if you enjoyed Eternia; but unlike Eternia, Vesperia has an awesome cast of characters).