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A lot of people recommend the Koreans.
I find the panels to be quite different from the Apple ones. Bad color, bad latency, not to mention dead pixels. Backlighting is dreadful, I don't think they ship any cables with it, it doesn't offer a lot of connectivity options, etc. Also, crappy...
A 920 is way more than enough for WoW, if you forgive the game for its inherent limitations. No CPU is going to perform adequately since the engine behaves like patchwork.
If you have to weigh airflow against noise, here's a good graph :
Link
Those are 120mm, but 140mm designs are mostly scaled up versions, so the values would be a linear approximation of what the graph demonstrates.
It shows that the Corsair edges out the Cougar only at high rotation...
You could need a new power supply, we have yet to know the wattage.
Point is, if you spent like 25 pounds on a 4GB RAM stick, you'd have a lot smoother experience overall in day-to-day use.
I think a GPU upgrade for gaming purposes really starts at 100 pounds to get a really sizeable...
You shouldn't have much of a problem with a single 680, unless you want 120fps or high multisampling.
But then again, a lot of games are badly optimized these days.
50 pounds might be too little for a proper upgrade.
You might get a better overall computing experience with more RAM, especially if you haven't switched to Win 8.
Also, you wouldn't need a new PSU, if your current one can't handle a GPU.