The problem with laptops is that they are not very upgradable. You have better than average GPU in there already and if it is a mini card (not a chip on the motherboard) the problem is they are not on the retail market and you would have to buy it either from the OEM (toshiba) or take your changes with ebay. Then the cooling solution in your laptop will have to fit it.
To sum it up! If you buy a laptop you are pretty much stuck with what you got!
Well rather than dishing out the money for a new PC, if FFXIV doesn't work that great on my current PC, I'll be looking at buying a PS3.
It's cheaper and all my other games run fine on this PC for now.