Mike,
use this stack up
non critical
gnd
critical
-5
gnd
critical
+5 (better if this was ground)
non critical
or
gnd
critical
non critical
power
gnd
non critical
critical
gnd (if power switch critical and non critical)
two reasons why I say put the critical in the center of the board.
First your board vender will be able to control the thickness of the traces
better, when they plate the board. Second your board will be a lot more
quite. You will then only have to factor in the etch factor to keep you
impedance.
Regards,
Ted
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