Ask Engadget HD: What's the cheapest media streamer that plays MKVs?

Our friend Nathan is a simple guy with simple needs. He just wants to stream MKVs from a DLNA server to watch on his HDTV and he doesn't want to pay a lot or do a lot of work to do it. We'll let him break down the situation:

I was about to buy an Apple TV for $99 with the express purpose of hacking it (jailbreak) to put XBMC on it -- to play MKV files from my DLNA server. And then it occurred to me, maybe there is a cheaper solution, that doesn't require a hack, for this purpose? What are the pros and cons of going with such an alternate?

So what is it: Roku, WDTV, the hacked Apple TV he was already planning to go with, or something else? Let us know what you'd recommend and why in the comments below.

Got a burning question that you'd love to toss out for Engadget HD (or its readers) to take a look at? Tired of Google's blank stares when you ask for real-world experiences? Hit us up at ask at engadgethd dawt com and keep an eye on this space -- your inquiry could be next.