I too am a budget reefer. I went with the RKL. It handles what I need it to (lights, heaters and a Tunze 6055) and is fairly easy to program. If the time comes where I need more I will upgrade to the Elite.

I have not owned an ACjr. so I can't give you any feed back on it.

For those recommending the Apex... yes, it probably is better. But it is a bit off topic since the OP specifically stated a budget option.

Tom