As far as I am aware, this is the cheapest 1080p MKV Media Player with built in DTS down-mixing to Stereo. It plays all the common media formats up to 1080p with ease.
The only issues I came across are that the subtitles are a bit small (and can't be changed) and the plug needs a US/UK travel adaptor.
My Youtube Review - http://www.youtube.com/watch?v=rN7qFOwbbaQ
In the interests of full disclosure - I must point out that I made this video review. I have no association with dealextreme - I just like reviewing cheap gadgets in my spare time.