Offered the seller $1100 which he's accepted; even with $54 shipping (bottom of SI) that's still a big saving over buying new in 2021, but dang I also wished I'd just bought a couple of years back when I first started looking.
Those savings will also cover the cost of a pair of elevation speakers - though when I mentioned this to my wife it was 'what, this is the first I've ever heard you need to buy new speakers!' (which isn't true, by the way!).
Rather than divert this thread onto surrounds I've started a new one - please pass on your advice on that if you have anything to suggest! https://www.geekzone.co.nz/forums.asp?forumid=34&topicid=293012