That seems fairly much the same here in Oz. The mc21 part is near spot on. You would be hard up trying to get 5000 pounds or $8500 for any mc28. I have never seen one sell for that price over here.
The 16/18 is quite close aswell. I've seen 18's advertised for 21 prices but they don't often sell. There is a person not far from me selling almost 3 18's for $3500 and they have been for sale for a while. 3 nsr's for $3500 is a good price but they are still there.
Andy
Bandit7