If you go on other internet sites there is a really big buzz about cosworths these days from non owners/enthusiasts, which can only be a good thing.
The 500s start racing again this year and that will have a big impact on anything cosworth related.
Prices are lead by low miles original cars in the classic market so examples like this are the ones people want and they simply cannot be replicated.
Sometimes you have to buy ahead of the market to secure a good car otherwise they end up out of your grasp, this very nearly happened to me. I bit the bullet and got in just in time.
If your dream car is a mint original saff get in now, as they will soon escalate like all the others. This one is probably priced a couple of years in advance, but you may well be kicking yourself in a few years when the best ones no longer come up for sale.
Cash talks and I am sure it could be secured for less