I put power feeders on all three rail at each entrance to the turnout. This eliminates any worry about the minuscule power wires/straps that are molded into the turnout base at the factory. Most of my turnouts are the 7.5 degree variety and I've had minimal problems through ensuing years of operation.
You will likely find that some Lionel cars will spark traversing some turnouts and this is usually because Lionel cannot seem to get all the factories to gauge their wheel-sets correctly.
I don't have a controller recommendation as I hand throw all my turnouts on my around-the-room layout.