Lizarazu-Blanc-Desailly-Thuram Evra-Vidic-Ferdinand-Neville Grosso-Materazzi-Cannavaro-Zambrotta Chiellini-Bonucci-Barzagli Capdevila-Puyol-Pique-Ramos
Well, the most consistent backline in 21st century EPL was Chelsea's 04/05, conceding just 15 goals in 38 games. IIRC, it was Gallas, Terry, Carvalho, Ferreira