Currently, we offer a special reseller package with LiteSpeed, but we don't use it ourselves. The main reason is that I don't like to support companies that impose their morals on their users (read their ToS). After some reflection, I will probably not sell it either to be consistent.

Back to the matter at hand, we use Apache for everything at this point, but I am compiling a list of the many different web servers with the hopes of testing and benchmarking them all.