New Computer: Upgrading from Mac Boot Camp

Hello,

I am looking for some help with upgrading my computer. I currently run FSX off of my 27” IMac. It is boot camped so i am running Windows on the opposite side. I am curious about a good beginning gaming computer. I recently have purchased some saitek pro flight components. Any help???

I am also willing to piece together a computer vs buying one prebuilt.

Thanks