Costco has the standard Blue Top D34M. Also, the blue tops have a side post, which I may need. It appears that the Original Motorcraft batts are not very tall, and I don't want the posts to hit the hood.

The Blue Top D34M has 750CCA@0C & 870CCA@32C, but has more reverse capacity (120 vs 100 @ 25amps) than the standard 34M. I noticed that when the battery appeared dead with hours of dvd's (on the wife's minivan) but still had enough to start and not leave her stranded.

Also, I get 2% back at the end of the year, so the blue at costco give me a little discount, plus about $70 off each battery.