OK, after a few years thinking about it, I'm going to ask Santa for an upgrade graphics card. My only 2 criteria are: (a) run FSX (and COF sometimes) as well as possible, and (b) don't screw up anything else.
I'm running FSX on Vista, Intel Core 2 duo, 1.86 GHX, 2 megs RAM (I think, but can add to this, up to 8).
My hesitation has been the adage, "Leave the well enough alone." It does run pretty well, but I want better detail and more FPS in dense scenery and at night.