I think you will be fine with wet cells and a KISS...I would not be so sure about AGM's. I'm not convinced with his argument...particularly if you are going to be hooking up solar panels as well. If it is sunny and the wind is blowing, you could surely cook some battery juice!
BTW...I think the KISS is a good choice...lots of folks happy with them that I know.
No longer posting. Reach me by PM!