AI prime 16 is the way to go for your size tank. I would say if you really wanted to pinch pennies, a current marine light would be OK, but since you're not worried about he $ aspect, get the AI prime. Adjustable, price is reasonable, has a great warranty, customer support from AI is outstanding, and a LOT of people use them--so we share schedules and spectrums.
As a bonus, the AI Prime 16 (or a Kessill which is a little more $) can be transferred to your next tank when you upsize. Then you won't have to buy two lights because you'll already have the one.
Oh, and the used resale market for AI Primes' is solid because they're a proven product.