I use Gelish too, and love it. Very addictive. Just be careful if you do your own nails, that you at least see 2 weeks thru before changing to another colour. Doing your nails too often doesn't do them any good.
When I do my clients, they last really well.. and on toes, forever
It's VAT free day at Sally's on Thursday so you can always take advantage of that. They can order any colours they don't have for a small delivery charge and they come straight to your home address. Last VAT free day they also had buy 3 get the 4th half price!