this is what i went with,
$195.00

Auto Zone 319458 H-7-AGM duralast Platinum

*** 850 Cold cranking amps (1000 cranking amps)***. 140 / 80 reserve minutes. Warranty consists of 3 years free replacement.Amp-hour: 80
Application: Automobile
BCI Cold Cranking Amps (CCA): 800
BCI Cold Cranking Amps Value: Tested to BCI Standard
BCI Designation: 94R
Battery Height: 190 mm - 7 1/2 in
Battery Length: 315 mm - 12 7/16 in
Battery Width: 175 mm - 6 7/8 in
Core Charge Applicable: Yes
Cranking Amps (CA): 920

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2004, X5, 3.0, 202k+