I'm pretty sure Group Size is related ONLY to the battery's physical size/dimensions. In general, what Bill says above is good advice, and good brands.
I'd add that I regard Reserve Capacity (or RC) much higher than CCAs when shopping a battery. Almost any auto battery will have enough CCA's to start your truck, but Reserve Capacity gives you a window into how long it will take to discharge the battery with a constant 25a draw. Give the accessory loads most of us run, the higher the better..
'95 D-90 ST - AA Yellow
"If you're not living on the edge, you're taking up too much space!"
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