Herbs

My current Kitchen Herb Garden is Parsley, Mint and Oregano. I'm trying to get a whole Mexican/Spanish thing going...I just do not know what kind of basil to get. All my helpful almanacs have failed and even the numerous books I took out from the local library don't give me much more information.
I'm also debating on what kind of chives to purchase..garlic or normal...it is a very hard decision. Please! I need help.