when i had my CRT i used 1024x768 all the time too, but as soon as I got my LCD i switched over to 1280x1024. Basically, lcd's look their best at their native resolution and anything else is blurry or not as bright (at least in games).
I just picked up my 710T yesterday and I am amazed by it! I have two other lcd panels that have VGA connections and the DVI is way better for the things you want. Since DVI is automatically perfectly centered you have a much better image with interpolation compared to VGA.
All LCD's use a basic form of interpolation that just streches the pixels. One thing I like about my 710t with DVI is that through the Nvidia drivers I can tell it how to handel non native resolutions. For example, I can use the video card to do the interpolation for me instead of the monitor. Or, I can tell it to display black boarders so that the image stays sharp at lower resolutions. I couldn't do that with VGA.
As I understand, thd 172x is being replaced by the 710T, so you should probably just go with that.
Read this post where i kinda went over it.
http://www.hardforum.com/showthread.php?t=804341