You'll probably want to get a Ray 2. Anything over 50 PAR is considered high light, so the 24" Finnex Ray 2 should give you what you want. At 18" between fixture and substrate, it produces 55 PAR at the substrate. The included mount raises the fixture by about 2 inches, and since I'm going to assume your substrate will be at least 2-3 inches deep, there's no doubt you'll have high light at the substrate level. The 18" Ray 2 might also work out for you if you can keep the distance between fixture and substrate somewhere in the 15-16", but you'd have to 4-5" of substrate. I'm not sure if that's too deep.
The sticky at the top of this forum shows PAR at depth for most Finnex units. A ray 2 is your best bet for high light, supplemented with a MonsterRay to help with full spectrum. The Marineland LED will likely be nice for lower light plants.