I would have to recommend the 4*60 for a second plane. I did it, and if you have built your confidence on flying the trainer, go with it.

My 2nd plane was a 4*60. I flew it, learned to fly a tail dragger / floater, then cut the wing on the two outboard ribs, making it a roughly 67"ish WS plane. Better performance, snappier, and an excellent low wing trainer. Now I fly a Model Tech P-51, but that's just me. I fly allot, stalled the 4*, and did what I had to do to get used to a low wing. The P-51 is AWESOME, but can bite your A** if you become lacks….

Pace yourself, LEARN your planes and YOUR responses, and then go with it!

ENJOY!

Wiqar