Also, if you buy new you also get with that a warranty and guaranteed support from the supplier.
If you are looking at eBay you need to be aware of warranties, can you get replacement parts / consumables for it.
Have you looked at something like the Carlton ChromaPeel? Its diamond microdermabrasion so no consumables, it also offers brush / sponge exfoliation and colour therapy, and it is £1,500. While the CACI Ultimate would be nice, this can provide a good introduction to of this treatment to a salon at a more affordable price. If it proves popular you can upgrade to a more expensive system.
Mat