All down to suspension set up, road surface/smoothness, type of driving, tyre pressure. Michelins get the support above, but you could try a soft sidewall tyre such as Uniroyal RainExpert, which seem to get a good review for noise or they have a new Uniroyal RainSport 3 out which scores well.
Generally, harder compounds will generate more noise, hence Pirelli being noisy and Chinese ditchfindes making a real racket.
I use Avons (they came with the wheels) and they are quite reasonable, however my winter tyres are very quiet and comfy - they go on soon.