Also... I figure it's about time to change my spark plugs (76k miles). I'm on Bavauto again am looking at two different ones

Spark Plug - NGK BKR6EQUP Part # : 12 12 9 071 003 $ 21.95 ea.
Bosch Platinum Plus 4 Spark Plug Part # : 4417 $ 5.95 ea

Why such a difference? Reading through the threads it seems people argue that the NGK are better, but for $22 each, is that a bit excessive?

Thanks everyone!