I would suggest a straight wing cord designs as Da Rock had gone exensively to explain to you.
However i would also sugguest going to a tail drager too.

I had a lot of fun flying the ace 4-40 but it is no longer in production.
It's not even a low wing...it's a mid wing or shoulder wing.

There's also the SE, Let your instructor take it up and land it for the first and maybe second flight
as you did with your trainer. As you get more comfortable with the model, you land it easily on low rates.