I spent $140 in a 60GB SSD and i no longer have that jumpy-ness when in town or coming to an aetheryite(sp?), i noticed the problem when i began to stutter and jump real bad and my HDD light was lit up solid, couple seconds later it was fine, but it became unplayable arrive to the adventurer's guild. Originally i didn't think it would make a differance so i bought a drive big enough to fit in my PS3 comfortably incase it had no effect, but it did, so i will have to look into more of a 128GB for FFXIV's future expansions to fit.

AMD Phenom II X6 1090 @ 4.2ghz
8GBs RipJaw 1333 @ 6-6-6-15
Radeon HD 5970 O/C 850/1200
Noctua NH-D14
Corsair F60 60GB SSD