timmcat,
Here is some food for thought:
NVIDIA's GeForce 6200 & 6600 non-GT: Affordable Gaming
THG Graphics Card Buyers Guide
VGA Charts IV AGP Video Cards
This page is specifically for FS2k4:
Flight Simulator 2004
Now when it comes to TC jr. you are going to want more horsepower then you are currently planning on. With Doom3 and Halflife2 out there, I would not recommend anything under the Redeon 9800Pro or the GeForce 5900XT.
There are some new choices on the market in the GeForce 6600 and the Radeon X600XT (Just be careful when looking at those cards, since most of them are PCI-E and you need to find one that is AGP 8X.)
Take Care,
Richard