I just purchased 2 NGK sensors both pre-cat at Advance for $75 ea and they come with a limited lifetime warranty! They were the same price as the Bosch, but the Bosch only came with 1 year of warranty. I'd check on the warranty on all of these, if they are the same go for the cheapest...
01 Disco II (Vader), OME suspension lift, ARB bumper, CDL, rear ladder, roof rack, Smittybuilt XRC winch, 265/75/16 Dueler Revo tires,
03 BMW 525iT wagon 5sp manual with sport pkg
02 Chevy 2500 HD