I'm making a list of software to buy when I switch from a PC-Mac in January....One of the things I'm looking at is X-Plane 9, but I noticed if you install everything it will take up apprx 70GB. How much would it be to install, say only the USA? Also, if new iMacs don't come out in January, I'll be getting: 20" iMac 2.66GHZ w/ 4GB Ram, 750GB Hdd, and 2600Pro. Would X-Plane run easily at the native resolution of 1680x1020? Thanks.