I highly recommend this:
http://www.xotic.us/effects/base_rc/
It meets
all of your criteria:
-clean, footswitchable boost
-2 band cut/boost eq so you can balance the exact amount of top to bottom that you want!
I love my Bass RC- it's one of the best pedal purchases I've made. It's very clean (no clipping or weird phase shifting), lets your instruments inherent tone through, is totally quiet (even at high boost settings) + the eq is very useful and musical sounding.
There's certainly many pedals that can boost your volume, but the RC is pretty much purpose built for what I think you want! The Creation Audio is great, but has no eq adjustment & has waaay more boost than you'll likely need (24 db is a lot!). Other pedals (like fuzzes, od's "fat-boosts" will likely color your tone - which is cool if you want that - but, the RC is very transparent.