I sold my derv anni, with 105k miles on 12 months ago for £7.5k. A car's worth what someone wants to pay for it.
the only people who could really comment on the value of a limited edition model would be the small segment of the market who want to buy one. I bought my anni for £8750, with a few bits needing doing! The markets small. You'll take longer to sell it, as the niche for them is small, but you'll get a higher return for one.
Just hold out.
What 32 have you gone for... couple of hundred more than your anni's worth and you could have had mine!

03 R32 Pearl Blue....gone
00 Imola S3.....gone
52 Silver Anni derv no 1728...gone
53 Silver R32...gone
E46 BMW lasted 4 weeks. Turd would be an understatement.
Bought a house.
04 Ford Focus diesel :-(