Help me choose a curling iron please!

I want beachy, soft waves sometimes and at the moment the only way I get them is a headband overnight method I came across - works awesomely but you need to be able to sleep on it or leave the band on all day long before going out - totes impractical!

So what is the best way to get gorgeous waves! Big iron? (Pretty sure a small one will give ringlets which I don't want!) Triple wand iron? One of those tube things you wrap your hair around? A straightener that does both??

Hit me with your suggestions!