System Spec's

Hi Guys,Im looking at buying a new PC and before I melt my credit card I just wanted to check (as my knowledge on the subject is mediocre at best!) if the specs were suitable.I am looking at running FSX with PMDG's latest products and a copy of Radar Contact.Here is the machine:http://www.novatech.co.uk/pc/range/irushpro.htmlI can't really stretch my budget any further as I'm getting a yoke and monitor too!I was told though, that FSX runs better with nvidea cards, so I was thinking of asking them to swap the ATI card with an nvidea one. Any benefit in this do you think?Thanks for your opinions!Richard