I wouldn't go too extreme with the build if I were you, but it's your choice. From what I can gather, FSX is EXTREMELY CPU bottlenecked at the moment, at least until they release a patch for it. Reason being is my brother's 8600 is pretty much idling when he plays it, CPU is maxed out, and it goes a little faster than my PC. You should do well with the Core 2. So...
If I were you I'd toss the 1000W PSU unless you plan on going SLI with those cards pretty soon. Also, you could just stick with "ordinary" Corsair XMS like celegorm said and save some green. The Raptor, eh, your choice, but I honestly wouldn't spend that much on a drive. There's a lot of tricks to get more for less we like to call "overclocking." So don't go too insane and buy the expensive gimmicky stuff because usually it isn't that much better than the "lower-high-end" stuff. Meaning it's not worth the extra $100.