I've run 13x5 et 40, 13x6 et 20, 13x7 et 10, 14x5.5 et 40, 14x6 et 40, 15x6.5 et 38
Current wheels are 15x6.5 et 38. In my opinion this is the best all round setup, if you want wide wheels you'd be best off following the crowd and put some 13x7 wheels on but you'd need to do arch work with the vast majority of available wheels