well i dont know anything about any of them but i got an apex..lol..looking it up seems to be the right one..thats if your going to be setting up a big tank..if not ..i really would thank about getting one..but the apex has more to add on in the long run if your in to all that stuff..just look it up..if u think you are going to want to spend more money on adding stuff..go with the apex but if not.. the rke is cool...
NOW if i can only learn how to use this dam thing..lol