The only difference is that DVI-I is a "digital/analog" connector while the DVI-D is purely digital.
Here is the difference in connectors:
Most video cards with the dual outs have the DVI-I because they will accept an adapter to go to a VGA connector (analog)
I have an LG L1920P 19" LCD Monitor with DVI-D input on it.
I have hooked this up to my PC, through the DVI connector on the back of my FX 5200 video card.
It took a little time to get it to recognize, a few reboots also.
Basically, I had to hook it up and let it detect, then switch it back to the VGA to make the changes in the display utility.
I also had to change the input on the monitor (not sure if yours auto detects or not)
It was kind of a pain, and I ended up just putting it back to VGA after it was all said and done.
I can only tell a slight difference in the image quality. You would need some pretty high end graphics going, and maybe a better video card than mine to see a very noticeable difference.