Quality Threaded Nokian Schreader is the way to go, 18months in the back of the Freerider and FINE, without threaded, letting the tyre down to push the valve out enough to get the pump on SUCKS.
I think the last schraeder inners I bought were cheapy things from Havant Hypermarket. Or maybe Halfords, 'cos they had a nice blue dustcap on. Either way, they've been ok.