Deffinatly look privately is my opinion, car yards are an absolute rip-off from what I saw when I was in the market a year or two ago. Sure they say they have a warranty but from what I have heard their warranties are generally useless.
One good example, when Aristo's started popping up, some car yards had them for 22,000+ and much lesser quality then the better ones I had seen on j-spec for almost half that.