Im planning to get a new desktop to replace my aging gaming PC right around when Leopard comes out, then dual boot Vista so I can run FSX and I will still use OS X, most of the iLife apps and other mac apps. However, I am stuck between the Mac Pro and the iMac. The iMac is several K cheaper and has the great form factor, but has a Core 2 Duo instead of a Xeon, and a X1600 instead of the X1900. The Mac Pro has the Quad Core Xeons, multiple HD bays so I can put Vista in another drive, the X1900, and easy expandability, but does cost about $3500 (including APBT, 20" Cinema Display, the X1900, and Apple Care). What I would like to know is how well does the iMac and Mac Pro handles FSX, does anyone have any experiences? Any suggestions on which one to purchase?