I just ride with my fingers in my ears and the cruise on, take 'em out when I slow down and the wind noise reduces so I can use the clutch and brake.
Seriously, try the cheap throw aways, if they don't do what you want, go to a gun shop or Wal-Mart sporting goods adn get a kit to custom make them for your ears.
After trying a number of different plugs, I have found the Hearos referenced above to work best for me. Don't ride without them. Unfortunately I didn't start early enough and my hearing was damaged from years of riding without any protection (wind and exhaust).
I just use the disposables from work until i finally picked up a box of 200 from ebay for $12. I can hear the radio better with them and i like the disposable factor. I have enough crap to keep up with. I carry a few dozen in the dash pocket.
I get custom molded plugs. A lot more comfortable, block out more wind noise than others I have used, and come in custom colors to match your ride. Go see an audiologist or go to a biker event that has a vendor mall as I have seen audiologists at these events and where I got mine. They are made of a soft silicone, and you get your mold back so you only have to do the sitting once. Now when I need new plugs I just send them my mold and they send me new plugs for about $90 and they last about 4 years