I put a lot of thought into which polish to buy. Out of all the brands I've selected during in-salon manicures, I've never found a discernible difference in quality when it comes to gel polish. After scoping out a variety of sets at various price points, I settled on the Coscelia 8 Colours Gel Nail Polish Set (£7), which has four and a half stars and features several options for colour combinations. This set seemed very Autumn-friendly, and I can confirm that they're all very flattering in real life, too.
Image Source: amazon.com