Just to let you know that the king of Stereo Width is SSL's Fusion Stereo Image, normally about £100, currently on offer at £69...which indeed is a good offer, however...
I've been trying other offerings in this field, along the way, such as the Fielder Stage plugin but the best value for money is a freebie, the Izotope Imager, I compared all 3 last night and the Image sounds great, and highly recommended, just be aware that anything over the 45deg lines are potentially out of phase.
These things are great for getting width on mono sound sources like guitars and Vocals
Ensure your track is a Stereo btw, otherwise you won't hear the effect.
There are some really nifty other fx for doing spatial positioning, such as bx_stereomaker, and the presonus pan thing (can't remember the name of it), that's cool because it takes the stereo pan and moves the 2 positions as a paired space together, very neat. The Soundtoys MicroShift gives some great widening/thickening options.
Anyway thought this might help and save you some bucks.
Anyone else got any recommendations?