Get the biggest battery that will fit on that tray! Look for something with AT LEAST 800 COLD cranking amps (CCA). I'm running an Exide (from Kragen) right now with 850 CCA. My old 300D had an Interstate battery that never failed me, so I'm lead to think that those are good too. I beleive Kragen warranties the Exide batteries for 84 months, which is nice.