Having said that, you won't crack 200rwkw with the stock turbo.
Also I don't know about the quality of work that workshop will do, but that seems about right for the quote they gave you. Having said that, you will gain NOTHING from a tune without injectors, fuel system, and bigger turbo. Otherwise you can simply increase the boost to a max of 11psi on the standard turbo and make roughly 190rwkw