If I were you, I wouldn't plan on spending any money on a gel polish system until you have tried a few yourself.
Last year at Excel, I went with naked nails and had 7 different products applied. I drew a picture of my hands on a piece of paper and scribbled the brand applied on each finger. I made notes while each nail was being applied (including timing, prep, colour range).
I kept them all on for two weeks and removed them myself and made notes of shine, wear, ease of removal etc. From that, I made a decision on which system I would use. I then did the relevant training.
In the end, I don't think I really considered price that much, it was more about finding a product I liked and had the confidence in to sell to my clients and increase my business.
For me personally, I made the right decision. The investment paid for itself within weeks and continues to have a massive impact on my business. I chose Nubar Gelicure as my favourite and months later added Gelish (my second favourite) for more colour choice.