Now that there's an NXT version of the tub I'm seriously considering, the Hotspring Aria, what am I looking at in terms of extra cost? Wireless remote, fancier exterior lighting, and polymeric (plastic?) frame and base equals what in terms of price? $1000? $2000? $3000? More? A few lights and a wireless remote I guess has some value but I'd like to know how much before I wet test and buy? At least ballpark.