Hey
Wookie I see you are into the Korg Wavestation.
(Plugin or real thing although the plugin sounds absolutely the same as the real thing in fact slightly better!) The Wavestation is one hell of an instrument.
I have been getting into the Roland JD800 a lot recently. This thing is in a serious class of its own for complex textured sounds. At this stage there is no plugin for it only the real deal but if you ever can get your hands on one you will be quite impressed. It is one if not the best Roland hardware synth I think I have every heard and played.
(I have had them all) And the weird thing is that it is an all digital machine yet the analog patches are breath taking. For editing sounds on the fly though there is no equivalent.
NI Prism is also in a class of its own if you are after some unusual and very complex sounds too.
Space Drone that comes free with the the Reaktor 5 player is also amazing.
Dronos is also very good for building the drone part of the sound.
Listen to the ambient master Brian Eno especially around
Ambient 4 On Land, The Pearl and The Apollo Moon Missions to hear what incredible ambient textures can sound like.