There is one advantage in letting it go now and that is that the values are up a lot compared to 15 years ago. That said, I'll keep my 2000S head and cab. I'd probably consider selling my 1x15 custom cabinet that I made, but not in any kind of hurry. I would like an early 200S and cabinet, but for me it is mainly for recording purposes and I can get the sound from the 2000S just as well, except I have to get it louder to get the same tones. I did sell my SVT head and cabinet when I was in EE school. I needed the money and the Sunn sounds better so the Ampeg went. I'm a tube nut for guitar and bass, so I doubt if I'll ever get rid of them entirely.
Greg
P.S. If you did decide to sell the 200S setup I might be interested down the road Isaac.