It depends a bit on your lighting. but if you're using HID's with under 4 feet of headspace, I would use about twenty or so 1-liter soda bottles and grow SOG style. Or use one 5-gallon bucket and SCROG a single plant. You're not going to have much vertical height for anything else after your pots, plants, lights and the optional filter.
If you're using LED's or fluorescents, you should be able to get about four 3-gallon buckets or a single 18-gallon rubbermaid, which again, you could SCROG in. Or if that's not your thing, you could fit 2-4 plants in a rubbermaid that size. Some people advise against multiple plants in a single container. I've found that if they're not large plants, and they've been adequately spaced, they will grow just fine. But again I would recommend SCROG'ing over that any day.