I have an alienware aurora R4 and i have to say its just fricking excellent. its pricey alright, but you pay for what you get. It came with windows 8, and i know all the problems some people experience with 8 and fsx but i have to say after abit of tweaking i never have a CTD and FSX just runs so smoothly with up to 50FPS with the orbix scenery. i see its still offered on the website with Windows 7 so probably a better version to go with but im very happy with windows 8, FSX and the Mighty Alienware.
Colin