@eahicks: That one looks like it throws foam particles everywhere.
@dypinc: That's a nice looking foam blade. Looks like it will work well and throw very little dust. Do you really need the full thickness that an 8-1/2" blade will allow you to cut? Just put the 7-1/4" blade on your 8-1/2" saw. You should still be able to cut boards that are up to 1-1/2" thick.