Well your going to get a million ( ok only 100,000) opinions, 4*40, Armadillo, SPAD, LT40 yada, yada, yada, ad infinitum.
Most of the ARFs are pretty good quality and will fly fine. if you like the "scale' type look go for one of the balsa/solafilm ones if you want something tough go for SPAD or Armadillo type.
ALL are good trainers
heres the SPAD Debonair i'm not sure if there are pics of some of the others.