What do you want from this type of product?
Do you want loads of colours including glitters, effects and fashion forward collections?
Or do you want stylish classic colours that will always be in fashion?
This will all depend on your salons existing clientele, or on who you want to attract into your salon.
Do you want long lasting shine and 2-3 weaks chip free wear, and would you want a product along side the range that adds extra strength to weaker damaged nails?
How much outlay are you willing to spend?
Do you already have a gel system in the salon, and a lamp for it that you would prefer to e able to use with a gel polish system?
I use Gelish, as it has an extensive range of colours and has Structure Gel for added oomph! I also can use any 36 watt UV lamp with it, although I chose to purchase the CND lamps (I have 2 ) just in case I ever decide to take The CND Shellac system on, and it will only cure with this lamp.
There is a lot to consider before taking on a range so if you could give us more info about what you want it would help.