Ok,without useing brand names or favorites I would recommend you first seriously consider what your long term goals are. If your looking at this 75 as test tank to see if you enjoy reef keeping but are open to or looking ahead to bigger and better tank then I would suggest the higher end controllers. So with that said you need to be honest and ask yourself "do I like programming" if the answer is yes then the reef angle or Apex is your choice. Both have Internet and phone controllability . Both have pretty much the ability to run yours and a couple neighbers tanks.If your not into programming and believe simplicity is the answer then go with the RKE i believe it comes with the Internet modular so you will be cool like most of us and have a panic attack every time you get a text away from home.lol if you plan to keep this tank for a very long time but like programming get the AC jr,if ya want simple get the RK lite. Controllers are nice tools but not a must honestly. I personally would recommend if your just starting get the reef keeper lite and use the extra money to upgrade the korila power heads to some vortech mp10's or 40's. the RK lite will monitor your Ph and control temp and if you have to have Internet they sell a simple plug and play module for a very fair price. Well that's my .02.