startouch boxes are awesome; tonally transparent, sharp-looking, and well built. i use an a/b from them and it has yet to fail me.
the radial engineering a/b/y is also great, and has a lot of options as far as grounding and phase and things like that go. it also has very little (if any) tonal coloration and costs a bit less.
loop-master also makes a great switcher (i have an a/b from them as well; it's MUCH smaller, which i like) and they are a little bit less "frilly" in terms of fit and finish but are also a great product at a lower price. check out
http://www.loop-master.com/.