Perhaps the greatest thing about this game is that there are a zillion ways to win.
One that I haven't yet tried but I intend to shortly is based on two "trojan horse" techs.
The top line factory and farm buildings. The first of these requires so many mp to create it can completely stop your ability to churn out buildings on small planets (unless you can rush build one to start with).
The second can give you terrible morale problems as your population cap needs a huge number of morale buildings to "keep up".
These buildings are undoubtedly double edged swords (so much so that you can actually end up in big trouble if you get them at the wrong time). This means I've always steered well away until I know I can cope with them. And therein lies a strategy to exploit. If they are such a pain for me, how will the AI cope if I researched them early and then gave them away.
If also I chose EVIL so that invasion methods are free I could invade poor morale worlds with Information Warfare and use mass drivers on the underdeveloped ones.
So my strategy is going to be.
Get a few planets from the rush.
Stop rushing before the AI does.
Spend more time on getting plain honest factories (and a good economy) on my planets (earlier than usual because I stopped expanding early).
Avoid ever building farms. (Or on big planets put loads of morale buildings with them)
Then research Industrial Sector. Trade it away. (Hell give it away if they have nothing I want)
Then research Farms to the top of the tree. Trade it away.
Research planetary invasion and see what a mess the Universe is in.
When invading go for Information warfare or methods which give the HIGHEST PQ drops and not really bother about defending them or building on them.
Essentially by contolling the timing of the introduction of these 2 techs try to be the only civ with usable planets.