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anyone "pitching" a Master Spa is being paid to do so, they are junk and so is the support you receive after the sale...don't take my word for it, do some Googling
The Island Spa Santa Cruz by Artesian is my personal favorite small spa as far as powerful jets and build quality for the price are concerned. I've never seen another 3 person spa with 3 pumps. This thing rocks. If you get it, make sure to add the propure ozone and inline @ease. It's an expensive little hot tub though and will probably push past $8k or more if you load it up, but if it's in your budget, check it out. I also like the Dimension One Triad for a powerful little pump. If I recall though, the Artesian is more powerful. Haven't felt a triad in awhile though.