You will be shocked at the prices. I dont think you can get an Artesian Island series for 6,000 and would have to go third tier on all of the major brands like Hot Springs, Sundance and Bullfrog to get in that price range.
I just bought an Artesian SouthSeas series 748L its 7' by 7' and nice quality with 48 jets. I paid about 5,500 for it around 6,000 after tax. I highly recommend it if your looking in that price range.