How do you buy silver?

[Ali Samana]

On another thread there has been some discussion on buying silver. Since I have been wanting to buy but am unsure I thought I would start a different thread for that. Here is my question. I go online to a site like:

http://www.providentmetals.com/bullion/silver/private-slv/100-ozt-bar.html

There are so many different types/brands of silver bars, how do I know which one to buy? or would you not rather buy bars but something different?