I found a used Marshall 1960a 4x12 cab locally. Described as like new cosmetic condition. $450. eBay shows them in various condition going for various prices. New price seems to be about $700-$750. I guess this sounds like I've answered my own question, BUT: this one has the G12T75s removed and replaced with Eminence Wizards. This is described as an upgrade but I am not familiar with that speaker. What do you think?