For 1600p, you probably want to stick with Displayport. The fun part is trying to find video cards with multiple displayport connectors that aren't also big honking gaming cards. I did come across this R7 250 variant by Powercolor
. Upside is it's only $140 and it has 4 mini-displayport connectors. Downsides are the cooler is an unknown entity and AMD's GDDR5 memory controller won't idle with more than one monitor plugged in....so it may idle/run 2D apps at 20-30W more power than an Nvidia card. The fan profile might be hackable using MSI afterburner or you could replace it with an aftermarket variety if it turns out it's louder than you like.