What to get for a O2 sensor?

[97GrandPrix3800]

Hello, The downstream O2 sensor went bad on my 97 Grand Prix 3800 (showing inactive on my scan tool) and i'm wondering what brand of replacement sensor to get? If i remember right i've read something in the past how bosch and other brands wasn't much good and to go with AC Delco... Is that true?

[Fivefingerdeathpunch]

denso/delco is what I would buy.

[midrange]

i just bought one tonight for my 04.. I bought NTK

[1996pontiac]

i just baught one and its bosch. both up and down stream

[97GrandPrix3800]

Has anyone tried a aftermarket one on a 3800 with success though? Denso to me seems like it should be good.

[MoarkatsINmuhtrailer]

I have always put densos in mine and my buddies. They have a faster response rate than the bosch and others.