Genocide

[Strategia_In_Ultima]

Mine all WPs, especially the unstable ones as - especially in MP games - that was where I'd expect an attack to come from. Nobody would suspect an assault fleet entering your home system trhough a damaging WP, so almost nobody creates adequate - or even ANY - defense arount them... so I'd launch an attack from there. Post guard stations around the stable WPs. If there are only useless systems nearby, and you've got high-lev Stellar Manip tech, make them into black holes and post guard mines AND sats AND stations on the WPs leading there.

Also, another tactic could be:
Take out all WPs to your system except one, then build a System Stellar Manip Shield to prevent further WPs being opened. Make sure the ONLY entrance to your system leads to a black hole and manipulate the WPs and systems according to approximately this layout to assure maximum safety.