I dont have an answer to your container question but I did however get bush by mistake and have them growing if you want to take a peak. They are probally toward the end of the video.

Here is a link that might be useful: my garden update on youtube

In general, the bigger the container, the better. Container plants are just so much easier to take care of and are so much more productive when grown in BIG containers. 4 gallons isn't all that big. So use the biggest you can afford to fill with mix.

Personally I wouldn't use anything less than 7-10 gallons. JMO

Dave