What would be the one most obvious component upgrade to get rid of the blurries at higher airspeeds? I suspect it would be a more powerful processor.
Athlon 64 3000+
Gigabyte K8 Triton mobo
Audigy2 ZS
All in Wonder X800XL PCIe 256mb
3 gig DDR 400
160 gig LaCie external HD (dedicated to FSX)
Allied 450w power supply
XP home
Your right.
A better power supply is in your future.
a faster CPU (preferably multi-core) would be the recommended upgrade for your current config.
However the CPU socket on your mobo is S754, which doesn't leave you with too many options.
Your best bet might be to replace the mobo as well, but this would most likely mean getting new RAM modules (DDR2).
I would probably leave everything as is, until you are ready to swap MB/CPU/RAM combo.
Your video card is not the greatest by today's specs, but should hold pretty well until you get more processing power.
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