I don't remember how hd201 sounds, and never tried h850 before. But I do own a ZX300 (sounds the same as ZX310).
I can't make a choice out of those 3 but I would highly recommend you check out audio technica ath-s100 / s100is
You can get these for under 100rm online. And for this price this is amazing. 
Compared to my zx300, the ath-s100is, it sounds so much better and gives much better isolation. comfort wise it's quite the same.

Can consider Superlux HD681 Evo. It's slightly warm and with more bass compare to other Superlux Series. Very comfortable for wearing as well and comes with velour pad.
Actually for lower range headphones, I do suggest to go for other brand instead of big brands for higher C/P ratio.
Not many audiophile in Malaysia actually know about Edifier H850. I bought it from China as it was rated highly from a famous China audiophile review website Soomal .
Once tested, I was really surprise by the performance. Never expect such a smooth and musical sounding headphone at this price range. For pop, classical, jazz and so on it's really good.
My sister is using it for her vocal teaching class now. 

If you prefer something with more bass and warmer sounding, can consider Superlux HD681 Evo. Superlux is always the brand that I recommend to composers and musicians for entry level sound monitoring headphones. It excels especially on details. Hardly find other headphones at this price range that can outperform it in terms of separation, positioning and details. But it may sound a little bright and sharp on treble depending on your set up. 681 evo is the headphone with the darkest treble among Superlux. Details slightly muddy compare to the same range Superlux brothers.