Just get an adaptor dongle, or a converter cable. It's the same protocol, only the connectors differ. Like DVI and HDMI; they're one and the same in different packages.
One other contender is the Samsung S27A850D. It's a very nice display, I'm using one right now on my PC. It's matte, but not nearly AS matte as the Dell offering. You don't notice any grainyness during use, but you also generally don't notice any of the hugely obvious reflections you get from the ACD/ATD (I have my monitors standing side by side, one for my Mac and the other for my PC, and the matte Samsung screen basically doesn't show reflections when powered off, while the Apple display is like a black mirror.
The Samsung monitor is cheaper and wobblier in build quality, using a lot of plastics instead of aluminium and glass and its LCD panel isn't as bright at max setting (although still bright enough to be uncomfortable to use during normal indoors use). Uncalibrated its colors are also noticeably warmer, and contrast is a bit worse according to my untrained eye. It uses a Super PLS panel rather than IPS, which is almost as good, but not quite.
It's also considerably cheaper in price and doesn't draw nearly as much power as an Apple display (doesn't need an internal fan, for starters.) Basically, only the power supply gets warm even after extended use at full brightness, while my ATD gets real hot at full burn. It also has height, pivot and rotation adjustments, which Apple displays lack, 3 video inputs (2 DVI, one Displayport) and has a USB 3.0 hub built in.
Its power saving features are really good btw. It has an ambient light sensor like Apple displays, AND an IR motion sensor which detects if you leave the computer and dims or turns off the display until you come back (or walk past in the background...

) It also triggers if you sit motionless for a while unfortunately, but these features can be turned off if one does not like them.