You can go to tirerack.com and enter your vehicle. From that, you can compare all the tires that currently fit your vehicle and check how they do for road noise, in the opinion of buyers that have rated the tires.
The impression of of the noise level can be more important than the reading on a dB meter. It has to do with the frequencies generated. Unless you et a spectrum analyzer, a dB meter just gives you total noise. Its the higher frequencies that are the most annoying and cause the most damage to your ears.