Bosch for the SLK, NGK for another Mercedes. If anyone happens to know of a sale and/or a rebate on either, please let me know. I'm in no huge rush, so I can wait for a good deal.
Thanks for the reply Brenton. Not sure what plugs your 230 uses, but the cheapest i could find the correct Bosch plug for my 320 was about $4.50 and it takes 12 of them. Ended up getting them on Amazon for $54 or so.I was happy with ebay, bosch, 24$ if I recall, free shipping