I use that $250 platinum diehard from sears. Works perfectly from a completely cold start at a balmy -55* F here in Galena Alaska. Thats with a block heater and battery blanket although I do wish I had a dual battery set up.

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OME 2.75" lift. JBA UCA's.
Flowmaster super 44.
BoulderBars. Home built stubby.
31X10.5 Duratracs
Yukon / Motive Gear 4.10's
Aussie Locker. Safari Snorkel.
ARB Diff Guard
Soft 8 - X7 - 4" BS

I just bought a Duracell branded AGM from Sam's Club for $140 that was Group 34/78. I've only been running it for a month, but that was a great price for an AGM.

http://www.samsclub.com/sams/duracell-a ... 3590233.ip

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'05 KJ Sport CRD w/ 109K
'00 VW Golf TDI w/235K
'97 Ford F250 PowerStroke w/235K