I still haven't sold them. I'd like to get 1,500. But if you're not local to Texas, near Houston, then I'm not selling.

no one is going to want that old *** except maybe the pentas.  And they aren't worth $1500

I wish you were near me, that's exactly the stuff I love, Id take the MX and VX in a second, too rare in the US. 

Forget all about 8000$ - the TV and video is worth almost nothing today. In Denmark those MX's are given away for free - the VX video recorder will probably need some service - those machines really get some issues over the years.
The Pentas probably have some foam-rot in the 8 mid-range speakers... no matter how little they have been used.
The Music system is the most interesting -especially the Beogram 7000, which is quite rare. The taperecorder will probably need new belts.

But - as others have mentioned - the best thing is to look it up on the net - Ebay and other sites, to give you an idea what the prices are in your area.