I can't help much on the flat panel, but can on the AIW 7500. I just got it this week. I am not much of a gamer, so I don't know how that is. I had a gf 2mx and I like the AIW 7500 because the 2d is much crisper. I am using it with a 19'' no name crt monitor. (it is a microsystems monitor)
I used to use a Hauppage WinTV GO card, but the drivers with windowsxp were terriable. The drivers for the AIW7500 are pretty good and there are new beta drivers that were released this week. I like the bundelded multimedia programs that come with the card. One program called "guide plus" gives me the TV programming for my area which is really nice. The bundle also comes with Ulead Visual Studio 5 ( I had bought the retail version to use with the Hauppage card, but it didn't work well. With the AIW it does work well (after 2 patches for the program) I can capture at high resolutions (now if only I had a dvd-rw). The bundle comes with a game, but the game was released in 99 so I am not certain how much of a benchmark that would be if I installed it.
One thing that I did have trouble installing was the drivers for the AIW 7500. Make sure you uninstall the drivers for your current card before attempting to install the new drivers. I finally found the problem with mine, I had to go into display properties and uncheck write combining, and then uninstall the old card from device manager (in windows xp). I havent tried installing the thing for the remote yet.
So far I am happy with the AIW 7500. I would have liked to gotten the 8500, but it was just to much money. These graphics seem crisp and clear and I like the way the tv software works.
There were a couple of threads in the video forum about the radeon family of cards.
Will