I never thought buying batteries was going to be so complicated  and thanks to Ajay things are falling into place.

My buddy just went with 3 of these for 675.00.

Looks like a pretty good deal given the AH's

 

http://www.trojanbattery.com/product/overdrive-agm-31/

Deka wet cells are similarly rated, weigh 10lbs less and about $130.00 a piece 

I was a Trojan battery user for decades SC225's and was told by a freind who owns a battery business not to buy Trogan anymore as they have focused on the golf cart 6V business and no longer have thier good engineer. The recommendation was VMAX Tank Marine AGM batteries for state of the art design and performance.

Group 31 is MR137-120, free shipping, 10% off 1st order and watch for sales. Check their specs out. I have 2 of these for my trolling motor for over 10 years now, without any issues.

Tom

PS, battery wt 75 lbs!, lighter isn't better in marine deep cycle.