If all your screens are 1920 x 1200 and under, I recommend 2 x DVI-D to HDMI Adapters for your 2 DVI ports(Reference cards have DVI-D DVI-I, HDMI and DP) and HDMI to HDMI for the last.
These adapters are passive and cheap to buy(you can get it as a single cable or an adapter. I would go cable). They may pass higher resolution, but that depends on the card and monitor in question.
Newer cards have done away with VGA(as well as the passive DVI-I to VGA adapters) so you will not be using VGA in the future(unless you want more expensive active adapters.).