Quick question about a laptop

[pauen]

I have 3 quick questions about the M15x Alienware laptop
One, I might buy one with this spec, is it good enough to play WoW at 60 fps? except for being in dalaran.
I upgraded the RAM to 4GB.
The LCD Panel to 1920x1080HD
And the Graphics card to the 1GB ATI Radeon Mobility HD 5730.
Should I upgrade the processor? It's at the i3 default. can go up to i7 but costs 1200 more, (no lol maybe later, it can go to the i5 for 200 more dollars)

And when you upgrade the resolution, does it change the size of the m15X (screen size wise)?