Depends on how deep your pockets are and whether you are going down the route of cutting lost keys, reprogramming etc. here in the UK I obviously work on the majority of european cars, mostly just opening cars with the keys locked inside or broken in the locks. If you need any advice on tools for european cars then please contact me. i have found that the best tools i have are home made, including lassoes, prodding sticks etc. Tools for later model VAG, BMW and SAAB vehicles start to stretch the pocket here in the UK but I am sure will be cheaper and just as available over the pond! Good luck, its a never ending battle, since once you find a way in the manufacturer does a mod and its back to square one! Still fun though! Picky.
That the tools exist is common knowledge -- just want general purchasing advice.
No need to ask.