There are 2 more options:
MAX4708, MAX4709
Fault-Protected, Single 8-to-1/Dual 4-to-1 Multiplexers
http://www.maxim-ic.com/quick_view2.cfm?qv_pk=3582
Maxim recommended the MAX4709 chips to Jeff for this application.
> http://www.uni-bonn.de/~uzs159/Switching.png
I don't see what you are trying to do, there, sorry!
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john