1. I would recommend the ATIs simply because that's personal preference. But the question also has to be what you are doing with it.
Want the best 2D graphics, get a Matrox based card the P650 is a nice card.
Want good gaming and good 2D (close to Matrox) then go ATI.
nV also makes good cards, but I wouldn't recommend their mid level cards, except the new FX5700. And their best low level card (the GF4 ti) doesn't have as good 2D graphics, but is a great gaming card.
Now more important will be the money you want to spend and the applications/games you want to run on it. PErhaps even a workstation card might be a better choice, then the nV Quadros, Ati FireGL, or 3Dlabs Wildcats would be an attractive choice.
2. Apple versions of the cards are for use in apple computers, and would be of little use in your gateway. But that's actually a good thing, as they are significantly more expensive than their PC brethren, and the apple ones rarely go down in price even with new releeases, heck I've seen the old R8500 selling for significantly more than the R9600 replacing them.
3. Since it's an APPLE monitor it likely doesn't have Windows Drivers (just a guess) and therefore it will show up as a plug and play monitor. You can try pluging it in and seeing if it recognizes the resolution right off the bat, but I kinda doubt it. So you will need something to tell windows how to perceive your monitor. You can also try unchecking the 'hide resolutions unsupported by this monitor' tab in your diplay properties segment of MS windows, that may give you the resolution/refresh you're looking for, but even then maybe not.
4, Yes, in this case you would need dual DVI output and two DVI to ADC adapters if you are running <b>2 APPLE Mintors</b>. If it is just THIS monitor and then any other generic monitor, then you can run the APPLE of your DVI and the generic one off the VGA adapter on your card. The only issue is if they are both APPLE monitors. Then you would need a card like the Matrox P650. But that solution isn't good if you wanna game. Then I would suggest finding the relatively rare dual DVI ATI Radeon or nVidia Geforce FXs. And then it would depend further on your gaming/app requirements.
5. It will be different depending on the graphics card you decide on, but they all have control panels that appear in 3 ways (that I can think of off hand). Right clicking on the desktop and selecting properties and advanced is my personal way (for all makers). You can also go into the taskbar and either you will have a display icon (usually the logo of the card maker) someone right on there or there will be a program in the start menu with it listed. the last way would be to go through the control panel and selecting display, which brings up the same box as the first example.
If you could tell us what you plan on doing with your setup, maybe we can get more specific about which cards of the groups to recommend.
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