Indeed. I'm upgrading to 2x200Ah AGM batteries. I had a lot of trouble finding batteries with that capacity which would fit in the boat. Eventually I discovered Mastervolt makes a "Slimline" battery which is narrow, and thus I plan to lay these on their side, one on port and one on starboard, back under the quarterberths.
I actually picked up the batteries on Saturday. Here is one of them:
They weigh about 120lbs apiece - not easy to move around! I still need to figure out how I'm going to strap them down.
I also took delivery of another new piece of equipment for the boat that I'm looking forward to trying out: