That looks like a really solid PC, Psion. That's my exact HD, and my PSU is the 650W Earthwatts, I have no complaints about either. I have a Radeon 5850 which is apparently slightly outperformed by the 6870, and my processor is trash so I'd imagine you should be good to go, especially if you overclock the CPU.
Ratatapa, I'm not a fan of leaving laptops on. I don't think it's catastrophically bad for them or anything, but they do tend to build up quite a bit of heat, especially if you have a game that's as intensive as FFXIV just running. I'd keep the PC for sure for things like that. And if you plan to be using it that much, I'd also invest in a laptop cooling pad.
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