After having built a rubbermaid and finished a few grows in it, I've found that I would've saved a lot of time, effort, and money had I gone with a similar sized tent over the rubbermaid. Might want to consider this. Rubbermaids seem really cheap in the beginning but once you get everything and its all said and done, you could have just bought a small dark room, homebox, or growlab and everything needed for it.
But to get to your question, you should go with short stocky indica type plants. I'd go with 1 scrog or many in a micro sog. A good strain to start out with would be Mandala's Hashberry. You can find that
here.
Just my $0.02.
-America