Definitely go with a 60 size trainer.

If you want to build one, the Great Planes PT-60 would be a good choice. It's big and strong. Mine is a great flyer.

If you want an ARF, there are tons of choices. The Global Right Flyer 60 is really good. Also the Hobbico Superstar 60 or Hobbistar 60, Tower Trainer 60........... the list goes on and on. They're all good, just pick the one that looks best to you and have a lot of fun with it.