I use the Izotope Stereo Image plugin (from Ozone 5). The best tool for it's designed purpose in my opinion.
For quick easy delays I often use Audio Damage's Dubstation.
When getting creative I use SugarBytes Effectrix and Blue Cat Audio's MB-7 mixer.
I also make extensive use of the Soundtoys plugins, superb.
These, of course, are inserted into the Pro Channel FX Chain module where I've created custom controls to quickly access the parameters I most frequently use. I love the FX Chain module, and would absolutely love more Pro Channel modules…please