Think you just asnwered your own question.Buy the SS unit.I used to sell it and loved it.Both actually but again for dynamics,bass control,less hassle it's way to go.If you only had one system miht be harder to answer and would say how much will you miss tube euphonics and mids and might say get a tube pre (both are worth their asking price) and used MC352 or other balanced recent amp.but if splliting time and using both for muisc go for 6900 per you own states as of late and saving money.
Chazz
Chazz