the best example i can think of in commercial techno at the moment would be Bryan Zentz - DClash

its a big, commercial number that sold well on Intec, but that riff is old skooooollllll, classic Yamaha keys!

also, quick plug, i did an old school house track sampling Dejure - Sanctuary. check it out

www.scottgray.btinternet.co.uk/The_Realm.mp3

its been submitted to Underwater records too