You should probably just go for a blank white HHKB for the full thorpe master race thock experience. <3 60%
Blue and brown are the same weight. Don't be afraid of heavy switches, many people that have sampled several switches (I'm talking around 20+ or so) usually end up agreeing that heavy=/=bad. Soundwise, they are a bit louder than a regular rubber dome but not as loud as MX because it doesn't make a plastic "clack" sound when you bottom out, it's a very satisfying thock sound... http://www.youtube.com/watch?v=fWPH7FAUfUY The sound in that video is amplified so you can hear it better, it's quieter in person.
They are very tactile, but also very smooth (smoother than any unlubed MX switch will ever be).