The 160 extreme has 4 15watt LED's instead of 2 30watt LED's. I think you should get the 160 Extreme. I have a regular 160 and think the 160 extreme would be perfect for your tank. I love the idea of the 4 15watt LED's. I like the 30watt LED's, but the are very intense, and like the idea of the better light spread/coverage from the 4 15watts. You might want different optics than the 60* ones, but whatever is your preference will be fine. The 110 Extreme might be good for your needs, but, in my opinion, the benefit of the 160 Extreme is the extra 4 15watt LED's and if you upgrade to another tank in the future, having the 160 Extreme over the 110 Extreme might come in handy if the tank is even deeper or mainly SPS.