Hey I found a site that has a lot of good (kinda basic) information about octopuses. If you don't want to read it, they have lots of good pictures and some videos as well. They seem to talk a lot about A. Aculeatus. They also make O. Cyanea seem like a very well suited octopus for aquarium life, I'm suprised more people don't house them.
Octopodoidea
Octopodoidea