Yes, Res, Refresh, Contrast/Aspect Ratio (Sometimes it'll be listed as "Dynamic Ratio") And you want a pretty good viewing angle, like 160°V&H, Display Colors (Around 16.7Million is common) and a good Response Time, 3ms for gaming, 5ms for regular. (The lower response time the better) And of course... The price
Acer makes KILLER monitors (For good prices).
What's your budget and what size are ya lookin for?
Resolution - 1920 x 1080 or 1680 x 1050 if you getting something around 19" - 22"
2ms for gaming. 5ms for normal. Must have DVI input. HDMI is optional. And get one with high contrast ratio.
How much do you want to spend?