What are the main considerations when selecting a tripod specific to camcorder use. There appears to be 2 x main common price bracket ranges i.e. those around the £30-£40 mark and those at the £75-£100 mark. At the moment I am looking at the lighter models of around the 1.3kg mark where I know that I will have to loose some stability for the lightness. What should I be looking for up at the business end?