I think the 400 made by Avon stopped being made in late 2007 (ish) so still some came out during 2008 . After this they became the 410 which was/is a zodiac boat with the removable tubes. I think they stopped making this in late 2011 - again still some in dealers going 'cheap'.
There are a couple of differant outhill steering consoles that could have been fitted - I went for the biggest with screen and stainless surround which I think makes it much more practical ( more space to 'stuff' on the console)- , most have a low console - with a coloured section at the top with nothing to hang on to and very basic instruments - ie tacho only.
Think I saw a few hull only sales at just over £4k in the last few months - if they are still out these they will be on B&O / apollo websites etc . From memory it was the main Avon dealers that had them.
Mine is on 210 hours and is 5 1/2 years old but I did less in it when I had a second boat. GIven its rigging/fit out and condition I'd want around £7500....( if I was seling which I'm not) and hope to get £8k on a good day from the right person.
If anyone wants to have a go in mine anytime PM me. I'm out wakeboarding from christchurch after work today in mine !!!