Mac Pro has a DVI or a DVI-D connector? What is the difference?

First of all i am really happy with my Mac Pro, thanks Apple!

Until now i had a old 15 lcd screen, because i could not afford a new one after buying my new Mac Pro.

Now i have enough money to buy 2 17 or 19 inch screens! But i have some trouble with selecting the right one.

I the past i had bought a AGP graphic card (for my G4) with a DVI-D connector. After that i found that it was not possible to connect my "normal DVI" screen too it. So i have to get another graphic card.

So, what connector does my mac pro have? (NVIDIA GeForce 7300 GT)

The specs off the Mac Pro says it has only a DVI connector, not DVI-D, or is it just the same?

I was thinking of one off these models:
- Iiyama ProLite E1700S-B2
--> has a DVI-D connector
- LG Flatron L1752HM-SF
--> has a DVI-D connector
- Iiyama ProLite E481S-W3
--> has a DVI-D connector

Can i connect all these screens to my Mac Pro using DVI-D?

Are there any screens you would specially advice me? I like Samsung, Iiyama or LG. There is no need for really good screens, i am not a video editor or a graphic designer. The screens has te be "relax" for my eyes!

I know it is possible to connect all the screens by converting DVI to VGA, but if it is possible i would prefer to connect it direct by DVI.

Sorry for my quite bad english, and thanks in advance for all your help!