You should probably do a little more research on the the various control systems before purchasing anything more. Legacy does not run on a Lionchief layout. Lionchief can run on a legacy layout. You cannot run a Legacy loco without the Legacy control system ($300 or so). To make it more confusing, Lionchief 2.0 will see locos that are compatible with Legacy but will be more expensive. Sounds like you should target a Lionchief or Lionchief Plus loco.
Brendan