You know I looked at them side by side in a store 710T ( Digital ) and the 712N ( Analog ) and with the $htty demo input they had I couldnt tell a big difference, so I bought the 712N.
I ended up seeing a 710T deal online the next day, so I bought it since it was such a good deal. I figured I would keep the one I liked best + sell my other one for close to whatever I paid for it.
Long story short I ran the two side by side on a dual head mirror for about a week( both calibrated with Avia Video Essentials ). I ended up keeping the DVI and paying the $100 premium. It was worth it to me, might not be to other people. Best I can advise is look for yourself, and do your own tesing on actual apps + pictures from the same source if possible. I didn't think the difference would be very big, but the colors were much richer and vibrant on the DVI. That percieved difference to you plus the acutal price difference between the two inputs should help make the call
Edit just to note, the 712N and the 710T use the same panel, the only difference was the DVI vs Analog input ( and the base as well, but not really applicable here )