I want to purchase a router that allows me to allow specified mac addresses access to only predefined web sites.

For example I want the computer with Mac Address xx.xx.xx.xx.xx to have access only to www.website1.com, www.website2.com, www.website3.com, etc.

I'd like to do this with a couple of computers on my network.

Most routers let me block only certain websites - not what I want

Most routers let me block the whole internet - not what I want

I have not found a router that will let me do this - but it would seem like a pretty obvious feature to me (hah!).

Any suggestions?