These 2 series are so forgotten they are not available anywhere digitally.
.hack series is not the best rpg. But It is close to my heart.
Valkyrie profile series needs more attention. both were beautiful and the 2nd game has to have the best combat system in any rpg IMO. the 2nd game was also one of the few ps2 games that could be HD if you got the cables.
A third would be Joan De Arc on psp. which got a digital version finally put on the store last year.