a small castle easy to defend,try to get a fortress in case u wont have a castle u will have wywern from fortress.
if is for a low rate,try a big castle to get taxes.anyway take a castle so that your clan will use teleport to clan leader,so if the server is a lil "buggy" the leader will make the quests for valakas,will go to any rb spawn etc and the other members will teleport to you :)