I think that's not too far off the mark. . .. for a brand new one. Might have been 2000 dollars at the time. Can't remember precisely.

I don't believe that it can be upgraded to Mk III, because the chassis layout is different enough. I have both a Mk II and a Mk III. I love them both, they're both great amps. I'd say the Mk II is a more forgiving amp, in the way that the integrated is a bit more forgiving for example than one of the Super Zens (or at least let me say this: I think the Mk II has a bit more forgiving nature than the Mk III, not stellar recordings can sound  a bit nicer on the Mk II than on the Mk III).