I always love competitive servers, like Nada and Rival mentioned.  However, I'm surprised you don't have a GunGame server yet.  GunGame is a great mod for all skill levels, since there is a bit of luck involved especially during the nade and knife round(s).  Also, the best GunGame setting, in my opinion, is the "pyramid" model where you start off with a USP, make it to the AWP, nade, knife, then back down from AWP to USP, then nade, then the knife would win.