Drop your module knowledge on me!

Hello fellow towerers, I've maxed cards and acquired 15 slots. About to start the long trek into modules. Let me know your insights, mistakes, regrets and pearls of wisdom. I have basically ignored them and have not done many labs at all. Willing to dedicate 3 labs for 3 weeks. I have many epics (around 100) for fodder. Only have ohm chip epic and BHD epic. Let me have it all!