Hi Piranha Plant,
Your list of plants will perish by the end of the summer, which in Miami is October. The only Florida grower we know who succeeds with N. lowii runs an air conditioner at night to achieve night temps down into the upper 50's low 60's. Obviously, he grows them in a greenhouse using controlled misters and fans as well. You don't want to know his electric bill!
The highlanders that we find will grow in Florida summer heat are species like ventricosa, maxima, some highland veitchii, some alata, a few others. However, once the highland species are combined into a hybrid, they become more heat tolerant. Key word here is 'tolerant'. Tolerant is not the same as 'thriving'. Keep that in mind. We baby our highlanders thru summer, providing a bit more shade, and maintaining a very humid yet bouyant atmosphere around them. We also grow them in clay pots. The porosity of clay allows for cooling evaporation. By late summer/early fall they are exhausted, and with the arrival of a shorter photoperiod and cooler nights they perk up.
The suggestion to grow lowlanders is a good one. We Florida growers live in a region where lowlanders can be grown to perfection if you take proper care. Growers in other regions of the US simply don't have the space to provide the warmth and humidity required to raise a bicalcarata up to full size. One of the greatest achievements in Nep cultivation is to have an ampullaria produce a carpet of basals, or to grow a rafflesiana that stands six feet tall with pitchers approaching a foot in length.
By now you get my point, and it is only a suggestion. Start with what will work in your conditions and learn how to grow it well. There have been some excellent suggestions here.
T. & M.
'Sunbelle'