...one of these would be neat:
No joke, a company called Parker Brothers Choppers in Melbourne, Florida is making a very limited run of seven of them. The price will be $35,000 each and they will be completely street legal. They listed one of the seven that they plan to build on ebay.
They've also made a non-functional replica of the Batpod from Dark Knight:
It's pretty cool if you've got half of a parking space in your bat cave sitting around needing to be filled with something that doesn't move. This one sells for a more modest $5,000, bikini-clad model not included: