Buying New PC - Opinions Wanted

Hi!

I've been gone a long time, but now I'm back! In celebration to having more time and a bit of spare money on hand, I've decided to get back into multi-boxing. I'm looking to play WoW but also Rift - no more than dual boxing, but with hopefully a dual monitor setup.

It's important to note that I am not very hardware savvy, and that's why I'm looking at buying a pre-built instead of building my own - I know that I might save a bit more money and get closer to the 'ideal machine' if I do it all from scratch, but I simply lack the knowledge. I've tried to wrap my head around it all before, and I'm just poorly suited to hardware knowledge in an industry that upgrades and updates so fast as the computer world.

Without further ado, these are the three rigs I am most interested in using based on the customer reviews for performance and quality, and I'd like to know which, if any of them, is suited to dual box on high (or better) settings:

http://www.newegg.ca/Product/Product...82E16883227578

http://www.newegg.ca/Product/Product...82E16883227574

http://www.newegg.ca/Product/Product...82E16883227545

I am willing to upgrade a few key components to achieve both optimum performance and ease my use of dual monitors - just let me know what and why it ought be upgraded!

Thanks a lot for your time, this community has been very helpful to me in the past.

Regards,

Llama