Do you recall what kind of wetsuit, and what type of tanks you were using during your certification? If it's around the same as what you expect to be diving in regularly, then I'd consider a stainless plate. SS plates are roughly 6lbs negative, AL more like 2lbs. So, if you need 14lbs total ballast, then it would be nice to get some for free on the plate.
Regardless, you're either going to need a weight belt or pockets for lead. If you go the pocket route, small pouches like
these ones are incredible. They're small, and can easily be moved around. Large pockets like
these ones with moving parts and quick disconnects, are junk. They're too bulky to give you much choice in where to put them, and much more expensive.
If you go the weight belt route, I highly recommend the MAKO freediving belts. They make one in
rubber (black only), and another one in
silicone (several colors). I've tried both, and they are both great, but I prefer the rubber one. The belts are stretchy, so when you descend and your wetsuit gets thinner, the belt stays tight. Unlike nylon belts, which you either need to make uncomfortably tight on the surface, or cinch up a bit at depth -- very annoying.