Primarily getting a hot tub because we have a great private backyard and husband refuses a pool. Want a big one for my teenagers to entertain, 8 person would be great. We are not mechanically inclined so need it to be good quality. And it's important to me that the cleaning system be good, to exclude mold,viruses,bacteria whatever. We have modest income. Any suggestions on what to concentrate on? Any specific unit you would recommend?