Such
The potential problem with an HDMI 'Selector' switch is that you'd be having HDCP issues if you had the switch set incorrectly before you switched your kit on and you would have to be constantly resetting the kit.
Your much more likely to get a stable system using a 1:2 HDMI (or DVI with HDCP if its only for Video) Distribution amp - the Gefen EXT-HDMI-142 has a UK SRP of £246.75.
See
http://www.gefen.com/kvm/product.jsp?prod_id=2514
Best regards
Joe