If you have not seen this yet check it out:
http://www.izotope.com/products/audio/iris/ This is a dare I say a revolutionary new soft synth from iZotope.
This takes things into new territory as it uses the technology behind their advanced Spectragrams that appear in their RX2 and Ozone 5 products and allow you to interact with them in totally new ways.
They also make fantastic use of their Radius time stretching technology as well to create a wildly refreshing approach to sound design.
The price point also seems to be pretty good as well.
Have fun.