The ES2 and Sculpture are also great for rich sounding pads.
Steve Horelick has a great tutorial where he builds ups rich sounding pads using Logic's synths and plugins:
[url]http://www.macprovideo.com/tutorial/logic304[/url]
Creating rich sounding pads is a combination of the synths and the effects applied to them. Delays, reverbs, and modulation effects such as chorus, phaser and flanger really make a huge difference to the end result.