Ya know you are looking at a good selection of spas there, much depends on your budget which is??
If you can buy local, I would. Internet can always save you money, but in the "long run" you have to look at what you are saving! Internet spa= hey my spa isn't heating? Call someone who cares.
Dealer= Hey my spa isn't heating, well try this and this, if it doesn't work give me a call back.. Granted that's a bit theatrical, but I hope you get the point..