I spent $70 on a Motorcraft with a 18 month replacement/84 month pro-rated warranty. Seemed like a good deal to me, especially since it had more CCAs than stock (obsolete) battery.

EDIT: Figures I buy one of the last batteries before they extend the warranty.

1998 Silver Frost SVT Contour born on...8/28/01[/i]
American Iron Shootout Radial Tire 2 Class Champion, Cecil County Dragway April 20, 2002