Spark plug Bosch or OEM BMW

I got... bosch platinum plus plugs... and you could feel the difference right away with the new plugs. started faster, idled smoother

As for your plugs, bosch is deff the recommended brand, but just about any high quality plug designed for your engine will work fine. (im currently running platinum in mine, and their fine, but lots of people have reported idel issues with them.) The motor was designed around a copper plug, so thats what it should run on best. so bosch copper is deff the way to go.

newer Bosch plugs, cap, rotor (maybe 15k ago)

Recently replaced original spark plug wire set w/new Bosch; wire set, distributor cap, rotor, O2 sensor and Platinum spark plugs

I think that the recommended plug (and original equipment) is probably a Bosch Silver plug, and that is what I would probably stick to if I were you.

the car seems to run really good at the .028 with the bosch plugs

Changed spark plugs, wires, cap/rotor with Bosch bits (w7dtc not those crappy +4s)

Do not use the Silber plugs. Mileage and performance suffers.

I've had nothing but trouble with the Bosch plugs, from their cheap-o line to their IR Fusion line...

this summer I switched from oem to platinum bosch plugs and just recently took to dealer and had plugs changed as they said the platinum plugs in fsi engine will cause some fuel to not burn properly.