Granted the factory installed Delco's aren't the best but there top of the line is right up there. That will be my future battery.
ACDelco Professional 6YR and 7YR Batteries: Best Free Replacement Limited* Warranty in the Industry | ACDelco News | ACDelco
Personally I paid for a warranty and I'll use it. If you don't mind paying for a warranted part then do what you feel is best. IMO I'd get it replaced and worry about paying 200 for another one some 3 years or so.
