Pretty good price on the Caspian, can't speak to the Bahia or J-355 pricing. As recommended, wet test, compare which dealer you are most comfortable with, and go from there. Based on the close proximity of the prices, I wouldn't feel negligent telling you to go with any of them. Compare the lifters. Make sure that the lifter you are getting is of good quality. CoverMates are good lifters, but check with your Tiger River dealer to see if they're including a Watkins lift that uses the aluminum channels for lifting rather than the seams.
Again, all are good values.
Sledjunkie will tell you over and over that you need to buy something else because he can't stand it when people are happy with something he wouldn't pay reasonably for. If you don't buy a tub from any of the big manufacturers at over $1000 off list price he'll tell you to keep looking.