Hannes, depends on what you want and your budget. Look at Vintage Speedsters but be sure to find out what engine and transaxle gearing you will get. If money is not a problem look at Intermeccanicas.
I'm having my second Intermeccanica built; it will be delivered this spring, but it will be expen$ive (you could probably buy two new "stock" VS Speedsters for the final cost of my HIGHLY customized IM). But a "standard" IM Speedster list price is around $26,500 dollars US.