Personally, having owned a blue switch (like the BlackWidow), 2 browns and two reds, browns and blues are not that different from each other in terms of loudness. I'm not sure why everyone markets browns as "the quiet alternative / stealth". Reds are probably the quietest. Perhaps blacks, but it depends how you type on both I suppose.
You should also note that blues are quite poor for gaming if you are anything more than a casual gamer. The actuation force required to trip the manner, at least for me, meant that I couldn't double tap. This was killer for games like Starcraft 2, and Battlefield 3. They are typist switches, and they are amazing for typing if you doa lot of forum/Reddit/essays.
Edited by GridIroN - 6/23/13 at 7:38am