AcJr is great if you don't need a web interface (the only reason I ended up with an Aquatronica instead of Ac Jr or even RK2).
For a chiller you probably will be okay running it on the DC8, but you may blow the fuse on it. Check to see how much amperage your stuff is going to use (it should list it on the chiller, I dunno if ballasts list it or w/e). The specs from neptunesys for the DC8 are Max 6 Amps, total current must be less than 15 Amps. The DC4HD is Max 12 Amps, total current must be less than 15 Amps. I think chillers run somewhere around 3 Amps depending on the size (i'm sure it's variable with chiller size) so someone like Manny who runs 2 chillers needs something more substantial than a DC8 if he wants his lights, pumps, heaters, chillers, etc all on one circuit. I think you'll probably be okay, but still check how much amperage you'll be drawing. I know that when I had my chiller, heater, pumps, lights, etc all on one power strip connected to one outlet in the wall, the plug would get warm to hot depending on how long the chiller ran. That's why you're supposed to use a few different circuits, including/especially a dedicated circuit for just the tank to be on, since everything related to the tank sucks up so much juice.
BTW I believe that most houses' internal wiring is a heavy enough gauge to handle 25+ Amps standard, because we looked into it when a friend of mine installed one of those stupid commercial hand blowdriers that he bought off ebay, and it took up 18-20amps or something incredible like that, and he wired it into his apartment and wanted to make sure the in-wall lines could handle it.
I'm sure Steve (oaigos) can give a better opinion though.
