Well, I have used CX-300 II and have lost it eventually. Planning to buy good IEM under 80USD(Though i live in india and will buy headphones in INR only)
I want IEM which would be more fun to listen and have some punch in Bass (Not too bassy though). I do not intend IEMs that have flat response. I am going to use them mostly on the move or at workplace just for fun and i will not be able to concentrate on the details they produce. So want something engaging and punchy. I liked CX300 II.They were good if not best.
Also one more thing, being in india i have very few choices available. Sennheiser, Sony, Soundmagic(not all models though), Klipsch, Monster, Bose etc. Brands like Shure, Ultrasone etc. are not readily available here. So consider this as well i while suggesting.
Few of my considerations apart from CX-300 II are CX-400 II, CX-175, Soundmagic E30, Klipsch S4 but i din't get chance to listen any one of them, neither did i find the comparison somewhere for me to be able to choose one out of them.