Hey we're going to West Palm FL in January and Great Barrier Reef in March and would like to have just one exposure suit. For people who get cold easily (like me) what do you recommend for diving in 70 degree water? In 80 degree water? Can I make one suit work for both -like with a core warmer? What brands do you recommend? Henderson Hyperstretch seems great but is expensive. Akona makes a 7mm for less than half the price. Any experience with this suit? Is 7 mm too much for 80 degree water? Cheers!