wrote:
It looks like I'll need new house batteries soon. This set of 6
Trojan T-105 has been function for exactly 5 years now. About 4 years
away from the docks. Before we had 2 Surette 8D's - cruised 5 years
and lasted 7 years before I replaced them early to go cruising again.

So - what's good now? Whatever it is has to fit in the 2 x 8D or 6 x
T-105 footprint. Too hard to change that.
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Your question is difficult to answer without without knowledge on how
you will charge the batteries. I think one of the best articles I know
of on batteries in general is
http://www.sterling-power.com/support-faq-2.htm.
I certainly wouldn't touch AGM for any kind of serious cycling use.