In the new product category, the MTH Z4000 is my favorite two-throttle-controlled, high-wattage transformer. Priced at around $650, it is hundreds less than a new Lionel ZW. It also produces a sinewave output which may have some benefits running some postwar engines a bit smoother at lower voltages. It has accessory outputs but if you are going to have many accessories and switches, you may need additional power sources.
The MTH Z1000 (with brick and controller) at $140.00 is the most cost-effective, single-throttle choice to handle smaller layouts. You can start with the Z1000 and later graduate to a Z4000 while using the Z1000 for auxiliary power needs.
For a used transformer, the postwar Lionel ZW is the solid choice but must be used with an external circuit breaker. It also is a great for auxiliary power applications. As with any used product, look for a reliable seller to ensure the transformer is in tip-top condition.
For only command-control applications, the Lionel PH-180 is by far the best choice.
