You should attack soutshore! Its got realitivly low lvl guards and not many players care to come when they see SouthShore is under attack on the world def chan. OF course, your on a different server, but meh.
Southshore zerg-spawns like no tomorrow. Been done, it's nearly unassailable.
We attacked one guard on a counter-raid after TM was getting owned, and I saw 3 groups of 5 guards spawn and run at me.