You can easily hook that up to 2 DVI monitors using a simple HDMI-DVI adapter. You can do 3 if you have a Displayport Monitor, or get an active Displayport to DVI adapter. Thats a great card, and all you have to do is get your hands on an HDMI-DVI adapter and it'll do all you want.
the only real benefit is if the HDMI monitor has built in speakers, the 5770 will bitstream the audio to it, so you'll get audio from the monitor speakers without having to plug in the audio cable to your PC.
I got a better/more vivid picture when running hdmi vs dvi->vga adapter. I also had overscan issues. Nothing that couldn't be correct with a few tweaks though. Don't buy any monster or super expensive hdmi cables. Digital signals are not susceptible to noise like analog. get the cheapest hdmi you can find.
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