So you're looking for a "really good designer to make an eye catching website" for £400? I hope you get sorted with something you like, but with that budget realistically you won't get very much! EDIT: I may have misunderstood you, if it's 4 layouts then that's not so bad, initially I thought you meant 4 separate templates i.e different designs
I consider the Mockups/HTML & CSS as a Web designers job, then the back end for the coders/programmers. Everyone's views on this differ greatly!