Just so everybody nows what I am trying to acomplish, the reason I started this thread is because I wanted to see what others out there are thinking, and doing. I do have my own ideas, which I am now juggling around due to some of the posts in this thread. This thread is helping me decide which way to go. For example, I have been trouble shooting electrical and electronic equiptment for a solid thirty years. I never liked the idea of switches due to the fact that I have replaced dozens of them in many aplications. I was going to go with 13 dollar switches until one of you guys mentioned vibration. Now I am thinking, good quality or not, is it worth chancing. Maybe I'll go with a Deans plug for a switch. More of a pain to plug and unplug but it seems to be more reliable. Point being, I might know, or think I know quite a bit, but there is often something overlooked.
Some of the replies have sort of mentioned, for a 40 size plane, there is no need to go to any extent. I don't get that. The way I see it, my Toledo Special cost $225.00. Saito 72 - $225.00. Spectrum AR 6200 - receiver - $99.00 and misc. bring the plane to a grand total of $600.00. Why not spend another 50 or 100 at this piont to cut down chances. Guys at the feild I fly at talk of bad switches, connections, and batteries too often in 40 size planes. I am not trying to make the plane bullet proof. Just trying to change the odds a little. How would I feel at this point if I lost the plane to a bad switch, battery, or connection if I do not spend the $50.00 for a back up. To me it makes sense to go with two quality Nimh without regulators, and check voltages and current draw before and after each flight. Maybe no switches. I'll tell ya, that was a good point made about switches and vibration.
More than the money that will be lost over a bad connection is the agravation building the plane due to poor instructions, and some shakey material.
I know you can only go so far, but it is deffinetly worth the money from what I hear, to double up the power source with minimal added connections.

Thanks again for all the input.
Mike