Thinking of upgrading my cpu/mother/memory

[Dinazzo]

Cheers everyone

i been running a
Intel core quad cpu Q6600 2.4ghz
8Gb memory
Nvidia GeForce GTX 280

i was thinking of upgrading to a
I7 920 proc
with 12 gig memory
same graphics card

i just wanted to know if this would help me alot or would i be wasting my money
the reason is i want better game play in cities and WG battle grounds

my current system lags in Dalaran and WG its not really bad but sometimes its just too much
as overall playing away from the cities and bgs it plays great hardly no lag just in those troublesome areas

cheers and thanks for the advice

Dinazzo