I am gettng ready to drop my 1st decoder in a loco. It is a N Scale Life Like SW1200. The Digitrak Decoder suggested are the DZ123 or DZ143 at $15 and $27 Respectfully. What is the difference between the two besides Amps? More concerned, the Lenz decoder suggested for the same loco is $44.00. Why is Lenz so much more in cost than Digitrak? That is a dramatic difference is cost. Any insight would be very helpful. Also, has anyone installed a decode in the Life Like SW1200? Thanks in advance.