Nigella's shows were good - I really enjoyed all but the last series, which I felt had been cobbled together.
Jamie's series are great, and so is Hugh F-W.
It's a pity you don't get some of our shows over there. One of the two fat ladies (the living one!) had a bookshop for cooks in Edinburgh, but Kyles told me she had closed it recently. She has made 2 or 3 series since the death of Jennifer. They were food and countryside matters made with an old friend of hers from schooldays called Johnny. A real old English gentleman... they go huntin, shootin and fishin and then she cooks something. The scenery is good too!
My favourite Scottish chef, Nick Nairn, has had a few series on TV, and now regularly appears on Ready, Steady, Cook - where 2 chefs are given a bag containing various ingredients (from 2 members of the public) and have to concot various dishes from those ingredients, supplemented with all the usual kitchen pantry things, like butter, eggs, cream, milk, flour and herbs etc.
As far as I know, we have no US chefs on any of our main channels anymore. I do recall seeing that grande dame, J Childs many years ago though! (we may get a couple on the day-time cable ones). Years ago when my family was younger and I spent more time at home during the day, I saw a little French-American chap, but his accent was almost impenetrable and I didn't really like his style of cooking.