Al,
Please let the forum know how the CR234 performs. If you are like most customers you will be very pleased, there just is not anything better.
As for which panel: pick the closest one to the meter. Since they are both fed from the same lugs on the meter the signal will propagate throughout all of your power lines. Do not leave any other couplers in place, as this will cause problems.
Thanks for your order.
Bill
www.homeautomationnet.com