I have been using a LCD for my desktop for the last two years and the only way to use it is by using the DVI connection without the DVI connectiuon the Image quality is ****!
The DVI connection gives your Image quality a 100% boost and Lucky for me my LCD has a Refresh rate of 85Mhz! which is not bad! Had a 25" Plasma Display from work that I used @ Home and could not get it pass 60Mhz Refresh rate without it Locking up! Hehe
When buying a LCD look out for two Things that are a must
1) What's the Refresh rate
2) DVI Connection