Difference Between Sog Flash I And Ii DVI-I Help!?

DVI-I help!? - difference between sog flash i and ii

I have to buy a Dell PC without a monitor, as he intends to sepertately a screen. My graphics card is a GeForce 8600 GT has two DVI-I / HDTV-out. My screen is a 22 "TFT LCD Samsung pebble it says on the website, the input signal

Input video signal: Analog RGB, DVI
Sync. Type: Separate H / V, Composite, SOG
Input Ports: D-Sub, DVI-D
Plug & Play DDC 2B

I wonder if I could someone tell me what should I buy cable, because I was not sure whether the difference between a DVI and two DVI-to help. How to work with them?