Ron Cooper is on my short list of most underrated builders. Unfortunately, his bikes and frames are very undervalued, IMO. They often go for a relative song on ebay - I've seen nice complete bikes with good parts (i.e. all Campagnolo) sell in the $500-600 range, and sometimes less. I'm always on the lookout for a nice one my size if it can be had for a bargain price. I suspect the day will come when they'll be appreciated at their true worth.
That "relatively undervalued" is good for people who appreciate fine craftsmanship and I should get a pretty good deal on the bike which is fitted out with a mix of Zeus 2000 components, Campy, and Sugino.