Not a big fan of MPC (but they kept Lionel alive and have great graphics), poor quality in the trucks, motors, etc. IMHO. Don't think you'll find MPC with magne-traction.
I do like the LTI offerings that had the look and feel of quality of post-war Lionel. My favorites include the remake of the yellow Alco and passenger car "Anniversary" set and the Southern Pacific Daylight steamer and Heavyweight cars. The multitude of "Bullion" cars has made me a collector of those