I recently bought a used Phase Linear 200. I think it's really an awesome piece of work. I like the sound a whole lot better than my vintage HK - but it also has more power, so not apples-to-apples. For $100, I consider it a bargain.
If you do go phase linear, and you are a bit handy - I would replace the phono jacks and power filter capacitors. Total cost of supplies (if you buy the good capacitors) should be less than $50. That's about all you need to "refurb" it if everything else is OK.
I really like the looks of the 400, and my experience with the 200 has been good enough, that if I ever have the need for more power or can get one cheap (<$150) I'll probably pick one up. Opening the thing up really shows that these things were built like tanks and designed to last. It seems to me that they were also designed to be repaired easily in case of failure as well - which I find nice in today's world of "if it breaks I throw it away and buy a new one."
.. just my 2 cents
