For folks on this side of the pond....
Molded earplugs are the way to go! If you don't want to spend way too much, go to:
http://earplugstore.stores.yahoo.net/silnatrubear.html
and do it yourself. You can spend as much or as little as you want. I have Koss phones in custom plugs.
I only have XM Radio, no phone, GPS, or comm. I have a TAO receiver with an external antenna mounted on my top box and find it to be fantastic! I did 388 miles yesterday listening to country and bluegrass in the boonies, and alternative rock to get through rush hour in Phoenix, 25 miles in one hour at 103 degrees! Channel 224 is Phoenix traffic, but why do I want to hear how slow it is when I'm sitting in it?