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Not sure what you mean by entry level.
Would the electric costs of either of these type of spas be significantly more than say a Tiger River or Marquis?
A heater on plug'n'play with a 1kW heater will not will not heat with the jets on high speed.
Brook,This shouldn't be a big deal for you since you live in a warm climate. A 1KW heater should do the trick. You won't be able to run the jets for 20 minutes at a time without a temp drop but most people run the jets 5-10 minutes and soak without jets part of the time.