The point of all this, is because I just got a new (budget) video card (GTX 650 Ti) and I did some research since it has a dual link DVI-I and DVI-D ports and a mini-HDMI port. I understand dual links to be better than single links, but I didn't really get the difference between DVI-I and D. So... in a nutshell...
Single link = Upto 1920x1080 screen resolutions.
Dual link = Greater resolutions.
DVI-I = Works for both analog and digital signals.
DVI-D = Digital signals only.
Which means to say that on a DVI port, using a DVI-I cable and a DVI-D cable makes no difference. As long as the pins fit, either is fine. DVI-I is just more versatile. And if your monitor has a native resolution of 1920x1080, then using a single or dual link DVI-I/D cable makes no difference. It would make a difference if you had, say, a 2560x1440 or generally anything bigger than 1920x1080.
And since HDMI is basically a single link DVI, whether I use (my current) DVI-I single link cable, or a (mini) HDMI cable, it also makes no difference.