I pulled the trigger on 3 x Rolls 12FS-240 batteries, giving me a total of 630 ah (315 usable) at a total of roughly 400 lbs, this was by far the most cost effective solution ($$2.50/usable ah vs double that for AGM). I've got plenty of real estate in the basement. I don't think I have enough separate use of inverter to justify a parallel set-up, I think that would complicate things unneccessarily.
For wiring of the batteries, I'll be re-using the 0000 wiring I had (between batteries, distribution posts and inverter), but I'm wondering if I'm better to wire the batteries in parallel (balanced) or just wire each individually to the distribution posts. Any advantage either way?