Ohhh, that makes a lot more sense than what that guy told me, that a bigger net pot means a bigger root mass. Thank you for explaining. I'm going to be using the DWC for my moms so I guess 10 inch would be the best.

Ok, I just came across another dilemma. I plan on cheaping out and using the orange Home Depot buckets that are a quater of the price as the black ones. Aside from light getting through the orange plastic (I'm going to cover them to block light penetration) is there any reason I shouldn't use them? I read before that it's best to use buckets made from food grade plastic, and I doubt these are. Is it a really bad idea to use them anyway for DWC?

Thanks again, I really appreciate everyone's help with my noobness