If you have FCP Studio installed just render out a full res movie file from After Effects and then throw that into Compressor. There’s a ton of really useful presets in there that can be customized to meet your needs(like applying gamma corrections to compensate for the compression). I don’t know anyone that does real compression for web directly out of After Effects. You could also use Visual Hub, it’s incredibly cheap and gets great results.
Motion Design, Color, Editing
Simulated Wood Grain Cabinet Inc.
Bunim-Murray Productions