Building a new rig.

Been talking with the tech gurus over at FSWorld just wanted some other opinions. I have a heavy FS9 collection and I will most likely be doing my flying in FS9 but I'm looking ahead with this build and thinking I'll definitely give FSX a shot. I'm looking at this setup at the moment on my budget. Phenom II X2 3.1 Ghz Black EditionXFX 9800 GTX 512 MB (may go with the overclocked edition), I've also been tossing around the idea of adding the GTX 260 in place of the 9800 but that puts me a bit too far north of my $600 budget. DDR3 1333 4 GB (2 x 2GB) Is it worth throwing FSX in my cart with my components or should I just stick to FS9?