Other than price, would someone please tell me the difference between these two cards and whether the Pro is any better for FS2004.128MB DDR ATI RADEON

Quite simply the PRO versions have faster GPU & memory speeds.This will translate into faster overall performance than the "Non-PRO" cards.Will this effect Flight Sim's performance? Yes it will. How much will depend on the cards in question & the only real way to know would be to do a side by side comparison.My guess for the 9800 series is that the 9800PRO will have roughly a 2-5FPS advantage in flight sim 2004 over the non-pro card. Generally Flight Sim requires more CPU power & Memory bandwidth than anything else. But a solid graphics card will alow you to run the sim @ much higher graphical settings.

Besides the differences that Jamiee lists, why go for a card that doesn't have 'pro' in the name when you have the option of getting a card that has 'pro' in the name? :-lol :-hah