You can buy some of the 355 replicas for around £10k, which is a fair bit less than a real one. I've also seen a few 250 gto replicas for around £30k, good luck getting a real one of those for anything like that!
There is quite a good 355 replica that parks near work sometimes, most people at work are fooled by it but then that's only when it's parked up!
Personally I'd prefer to have a zed.