There are some digital TV (non-HD, but pretty nice) recordings called "G'kar" (German) and "TB" (Scandinavian). To my untrained eye, the G'kar looks very marginally better, but it has a German crawl and alien subtitles (for IV and VI).
I've also heard of a "Reivax" version of IV, but don't know what it is.
The nicest looking version is the Team Blu bluray upscale based on those first two recordings I mentioned. They've got their own thread for it. Only IV is out so far.