I would highly recommend the AutoCraft Gold Battery, Group Size 48, 730 CCA from Advance Auto Parts.
This battery is made by Johnson Controls, who also make the OEM White Varta.

Buy AutoCraft Gold Battery, Group Size 48, 730 CCA 48H6 at Advance Auto Parts

These are Engineered with PowerFrame positive grid technology.

Discover the PowerFrameŽ grid technology :: PowerFrameŽ TRUE STRENGTH

AdvanceAuto also has the AutoCraft Gold AGM made by Johnson Control.
Notice that the group size for AGM is called H6, which is same as Group Size 48.

AutoCraft Platinum AGM Battery, Group Size H6, 760 CCA H6-AGM: Get the best at Advance Auto Parts

AGM battery technology | Johnson Controls Inc.

UPDATE on 11/9/2014: Use code M42 for 15% off purchase, plus get $25 credit toward next online purchase of $50+. Good til Nov.15
Must be purchased online but can be picked up @ local Advanced Auto -or- delivered. And they will install it @ the store for FREE!