I built my current system about 1 1/2 years ago and it runs rather nicely (so why am I bitching? I have to complain about something). :P The only thing I care about is Flight Sim. The way I look at it is if this machine can run FS9 fine, then all other apps and tasks that I use will run fine as well.
Here's my problem. I love AI. I love tons of AI. I keep my FPS locked at 25, and for the most part it stays at 25 FPS. However, when I get to airports with much AI, my FPS drops to (IMO) unacceptable levels. Perhaps it's time for an upgrade in my hardware? I wouldn't mind if I have to build up to one of those "super sweet systems" like asda_price, gixer or the_autopilot has. The resources are there. What I would like to do is slowly upgrade piece by piece until I get to a point where I am happy with the performance.
So please tell me where to begin. I would also like to know things like how much better is a PCI-express card over AGP? Is there a possiblity that M$ will release a version of FS that takes advantage of SLI setups or a 64-bit CPU? And so on, and so forth. ???

With that said, here are my current specs:
- AMD Athlon XP 2500 "Barton" 333FSB CPU (OCd to about 2.2 GHz)
- ASUS A7N8X Deluxe mobo
- 2 sticks of 512MB Geil DDR Ram PC-3200 + 1 stick of 512MB OCZ DDR Ram PC-3500 totaling 1.5GB RAM
- ATI Radeon 9800 Pro 128MB (not overclocked. How much more performace can I squeeze out of this card by overclocking?)
- ANTEC SOHO tower case with 400 watt power supply
- Windows XP pro

Thanks in advance for all your help and advice.