I use this 5x1 switch from Monoprice and it works fine, switching 3 devices, which are then routed through my AV receiver's switch... Despite the convoluted hookup, I have not had HDCP handshake issues.
http://www.monoprice.com/products/product.asp?cid=101&cp_id=10110&cs_id=1011002&pid=2777&seq=1&format=2&style=
The nice thing about this switch is:
1. It works: no discernable loss in quality, switches relatively quickly, etc.
2. It's cheaper than many others, like Gefen, or even the Xtrememac (which is 4x1)
3. The remote has discrete buttons for each input, which is very helpful when setting up a universal remote like my Harmony 880. I can't tell from the Xtrememac picture if it's a direct input, or if you can only cycle through the inputs...
Good luck!
MacBook Mac OS X (10.4.9)