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The "Dim One" does have some nice units and to be honest, those prices aren't bad for that unit but there are a lot of less expensive but nearly as nice units out there. The Jacuzzi J-375 is 91x91" (nearly 8x8) and has a full lounger and can be acquired for as little as $7,500
If I was looking for a new (well built spa with lounge) or a two year old model what are the most trouble free spas. I dont want one that is from a traveling show... nor do I want cal junk or united spas had them both and nothing but issues!
For 3-5k, I would recommend checking out the Hot Spring-made Hot Spot Trinidad. It's a fairly deep tub at 34", and the way it is sculpted you can actually fit 5 people in it comfortably. If you wanted to spend a little more money, check out the Tiger River Bengal.