@John57 - It really depends on what features you want to offer your customers, and how much money you have to spend.
I recently spent about $2000 on a pipeless pedicure chair. There were several things I liked about this chair, and my customers just love it.
I like it because it is portable and there is no plumbing to worry about. It is also easier to keep clean and that is very important to me. My customers like it because the chair is a massage chair that reclines and is heated.
There is also an adjustable foot rest that comes in handy for both of us. This may sound like a lot of money up front, but I expect this to last a long time.
Since both myself and my clients are happy with it, I feel like it was a good investment.