Is getting an iMac to play CloD a stupid idea?

[Vengeanze]

First, money is no object (almost). All I care about is aesthetic, framerate, clean desktop and a happy wife.
Currenctly got an 2009 iMac which my wife loves. Building a PC, keep the current iMac and crowd the desktop with an extra monitor solely to fly CloD is an option but the wife will be pissed.

So looked at selling the iMac for $1000/€665, take the money for a presumable PC apx. $1200/€835, add another $830/€577 and buy me the new 27'' iMac with the following specs:

3,1 GHz Quad-Core Intel Core i5
4 GB 1333 MHz DDR3 SDRAM
AMD Radeon HD 6970M 2 GB GDDR5

What's your take? Will I be able to run CloD at all MAX and still get >30 fps over London with a shitload of other planes in there?

Thing is I know that resolution has a great impact on frames and the iMac comes with a native 2560x1440.

A 27'' iMac is pure porno when it comes to looks. Especially if I mount it to the wall.