Just some comments really
ST-E2 has less range than the 580EX when used as a master, and you can rotate the head for better line of sight. I guess if you zoom the flash to 105mm that will help too.
Outdoors, if there is bright sun shining on the receiver, max range for my multiple 580EX guns is cut to 4m with direct line of sight, 5m at best. Merely shading the receiver doubles that at least, and if it's dusk or dark I can get over 20m.
Indoors, I have never had a problem and the trigger signal gets reflected around corners and behind things with pretty good reliability too.
I guess what I'm saying is that indoors I really wouldn't bother with radio triggers. Not necessary, and of course you lose ETTL (except new Pocket Wizards). Outdoors, usually okay for most set ups as you naturally need to keep things close together or you won't have any flash power anyway. But if the sun comes out, or reasonable line of sight can't be achieved, or you need to stand back with a longer lens to get camera position, you could get snookered.
Those new Pocket Wizards look the absolute business

Maybe one day. Strobist nirvana will be when Nikon/Canon build radio triggering into their guns.