i just ran through this same thing.....use a denso, they are better than a bosch.(i know, i refunded many when i worked for advance auto parts) denso is more accurate. i read up and searched them before i bought it and i am sold on them now..
I'll also agree. Like mentioned above I used a bosh for a while and had no problems. But did end up returning it and replacing it with a Denso. Even got it shipped to me and was way cheaper than any o2 that I could pick up locally.