It's probable that 50% or more of the woodworkers here have at one time had a set of Narex chisels. Either started with them, or tried a few loose ones. They are nicely priced, and have ok balance, and can be sharpened to a fine cutting edge. From there is where they start to differ from a lot of the chisels sold for more $$$$$. They will require much more frequent sharpening than other better chisels. If you stop and sharpen as you need to when they start to show signs of becoming dull, it is a quick process to get them right again. However if you go too long before sharpening they will require more, and longer care to be right again. The metal while being ok, is not great, and that is the finding of the middle tier of chisel.
Buying old sometimes you can find some older chisels for much less with similar, or even better metals, however, sometimes they just look like very expensive collectibles though.
At one time the
Japanese chisels at Grizzly were said to be of very good quality metals for a low price. LV has some nice Japanese chisels too. I would suggest these for lower priced chisels.
I would suggest you save a few more pennies, and give up the idea of a set, and buy individual sizes as you need them, but buy nicer chisels. I really like these
Veritas PM-VII bench chisels from Lee Valley. Once ready to work, they will keep working without a lot of fuss for a much longer time, so you are chopping, rather than sharpening
You don't say what you plan to use these new chisels for. Different tasks are sometimes done better with different chisels, so if you have an idea of your need, share that, it may better form your answers.