Your specifications are: small and clean. My club, the Imperial Ground Forces [IGF] is not small, by any stretch, but it is clean and very active with many great features.
Because I do not wish to post the information again, for everyone's sake, I'd like to direct you to the following link to let you in on some information about the great army that is the IGF. The link leads to a topic on this forum.
Imperial Ground Forces
I hope you decide to join the warm family of IGF.