I'm basically going to echo el-Spood with the price bracket.
There's an entire world of difference between your sub £100 and your ~£200 chairs. The key thing to look for is how long they're designed to be sat on. The ones which are designed for 8 hours are where you should be looking.
F'instance, I have one of
these, which I bought in a discount for ~£150 ish. The
blue one is a bit cheaper.
It's miles better than the ~£60 office chair it replaced and all the ones that went before it, and to be honest, it's not far off the very good ~£500 woth of office chair I use at work.
Not perhaps what you wanted to hear, but it does make a world of difference.
