Very important and valuable consideration!
None that I'm aware of.
I consider the 5000 & 6000 pretty much interchangeable.
Cosmetics are not really a concern - who cares how it looks?
Just as long as it works well.
Off hand, only one other SD FTA receiver had after-market or excellent factory firmware support.
If you find a Visionsat IV-200 around for cheap, it would be a very good choice, too.
Anole,
I would like to test a Visionsat IV-200, now. Since you recommended it, I wish I had one to play with. But, I think I am done buying for a while. I have a closet full of FTA receivers (some with bad reputations) and some that I wouldn't part with, ever! Like the Coolsat 5000! I started buying more of them (the Coolsat 5Ks) when the hackers determined they couldn't use them any longer. I knew that they were excellent DVB-S receivers and I wanted to acquire as many as I could so that I would always have spare parts to keep at least one of them going for a long time. I had to stop buying them eventually, though. Currently and for the past couple of years, I have been applying my Coolsat 5K and my AZBox Premium and Premium Plus for my FTA endeavors. I am quite satisfied with both and both are incorporated into my entertainment center.
Personally, the Coolsat 5K (4K and 6K go right along) were the best FTA receivers ever made, so far. They still work and they are so inexpensive, then and now, you just cannot beat them! Of course, they don't have all the bells and whistles that everything else does now, but they are damned good! I still won't give mine up! I still use it! In the future, the Coolsat 5K might become too outdated, but I will have quite a few years to go before that happens, so I am keeping all of mine.
I am currently an advocate of the AZBox Premium and Premium Plus models. With their unique problems and glitches, I still have to love them. I get a great deal of personal support from the OpenSat company. In my mind, they are the next greatest receivers to the Coolsat early models. Not because they are so easy to use as the Coolsats are (they definitely are not that), but because they do so much more than most any others do at this time. I will keep these AZBoxes, too! Even with their quirks.
RADAR