As well as considering the height of the stand, you should also think about the number of hangers you want. You shouldn't opt for too many hangers since this can cause the stand to look crowded and be less useful. Too few hangers could mean that you end up thinking about buying a second valet stand.
In order to choose the optimum number of hangers, you should think about your own individual requirements. The answer will vary from one person to the next. If you regularly find yourself having to hang your blazers for work or occasions, it could be worth buying a stand which has 4-5 hangers. If you only use it occasionally for a couple of items or one specific item, then buy a stand with just 1-2 hangers.