You dont need to buy another monitor,the IIYAMA E2273HDS will be fine,
a DVI D connection will fit into a DVI I.
The DVI cable supplied with the monitor will be ok.
hi man with that kind of card i would highly suggest a 120hz monitor, with a 120mhz your will be able to experience the speed of the card, alot of people say it doesnt make a difference but when i recently upgraded to a 120hz i could definitely tell the difference as i have 2 gtx 680s. just a suggestion if you want to feel the increased response and the higher frames which you will definitely be getting with a 690.