If you're going to hook up 3 monitors, one of them needs a display port ( Like this one) Or are you going to use an active converter?
Do you want all three to be the same monitor, and how much do you consider alot?
You'll need something like this Active DP to DVI , I've seen some cheap ones around $60, but I can't suggest any specific one.
As for the monitors themselves, this one is quite cheap Sceptre - Newegg .
I've used Sceptre before and had no problems with them, but if you want a better brand name, the ASUS would be a great choice.