I'm currently using THIS curling iron and have been for about 2 years now. I really like it. It's a smaller sized barrel (3/4 inch) so it gives me tighter curls which helps me hold them longer. I use Big Sexy hairspray and THIS Aveda paddle brush.
Also, this is really the only way I wear my hair. I never leave it straight. So I have my hairstylist cut shorter layers in my hair specifically so it will look better curled. I like for my curls to start closer to my crown and the only way to achieve that is with shorter layers. So if you feel like your hair is only wavy on the ends instead of starting higher on your head like mine, that's probably the reason why.
If you have any questions leave them in the comments!