Hey Hexit, You are right about everything else about X-Plane 10 except one thing. You said: "but its still gfx limited in that no1 with 1 gfx card can play the game above medium..." This is simply untrue. Austin Meyer and Ben Supnik themselves have stated that X-Plane 10 does not support sli/crossfire (ie. more than one GPU), But they are considering adding support for it in the future. All you need is one powerful GPU to run X-Plane 10 on high settings, I know this because I run it on high settings with my 1 GPU: a Radeon HD 6970.
Also, X-Plane 10 is a 32-bit application so it does not use more than 4 gb of system ram. They are also in the process of fixing this and are porting the code to 64-bit, Though they say this may be a while off, maybe a year or more.
I am an X-Plane fan and fly it daily, Just stating the facts.