Anything that gives you options no matter how crappy it is. I buy monitors with VGA, DVI, HDMI & Built in speakers, and if you can find one for cheap that also has DP then you have found yourself a great bench monitor.
I forward this thought process to clients as well. They will be like oh I want a cheap crap monitor for my cheap crap employee. Oh really do you? So you don't think there's a chance that monitor might be re purposed in the next 5-10 years to someone who may need built-in speakers or HDMI for another $30?
It's always a treat when you buy a crap piece of hardware and the client comes to you asking you why you sold them a piece of garbage even though they requested it 2 years ago but can't remember... and now want you to buy a new cheap piece of garbage that will last 2 years because they're irritated you sold them garbage in the first place they have to replace.
Man I sound like an old grump and I'm only 34