I don't even have MKV rips, instead all my DVDs are ripped in AVI because I don't even have h/w that plays MKV forget Full HD. I am choosing to wait for DVDPs with Divx 7 profile and then will progress to H.264/MKV rips. I tried the HTPC route but had a lot of issues from packets dropping to plain ground loop noise and just gave it up. Instead I have a HT system with a PV8 and a Panasonic 29" CRT TV that work just great for my Divx rips and DVDs.
Come on its high time to join the MKV/h.264 bandwagon. If you are still talking about divx then most probably you have not seen what MKV 720/1080p clarity can look like. And they all have dd or dts 5.1 audio. .
I guess PV8 is plasma TV which can support HD.
HTPC route is not difficult if you have the hardware & software installed. That's where WDTV comes in. For this price you CANNOT build or even upgrade a PC for MKV playback.
I know you have a slow internet. But then you can try to source them from your friends. Otherwise come & meet me