FFV/Bravely Default, FFT, and FFTA for all the reasons Fynn mentioned. FFV and BD are years apart but I agree they are very similar systems.

I'm adding FFX-2 to my list. It's got the customization of FFT with the added bonus of quick-paced battles that allow you to change jobs on the fly. I love the bonuses for switching too which adds another layer.

FFXI is my final entry. It's a straightforward start each job at level 1 and gain abilities through level up and buying spells system, but the addition of weapon skills and subjobs opens up the door for some nice customization. I was a Blue Mage which had its own customization possibilities with setting spells and I loved it.