Just run your LCDs on their native resolution for the best picture, The Extended display identification data (EDID) from your monitors will tell your PC you are using LCDs. Basically, you don't have to worry about p or i
"Virtually all fixed-pixel displaysLCD, DLP, LCOS, or plasmadon't form interlaced or progressive images. Instead, they display each frame all at once, not line by line. However, the signal they receive can be interlaced or progressive. If it's interlaced, the display has to convert it to progressive and scale it to its native resolution before it can display it."