There's always stainless steel like 953, XCr, and KVA MS2. My main ride is a 5 year old polished 953 Waterford, and it still looks brand new. I don't have to worry about paint scrapes or rust in spite of frequent rides in the rain, and it rides like steel (because it is).

A number of builders at NAHBS last month (Sam Whittingham of Naked Bicycles and Design, Dave Anderson of Anderson Custom Bicycles, and Dave Wages of Ellis Cycles among others) showed stainless frames made with KVA.