If your body shape and size are somewhat different, select a harp to match your frame. Generally, square back harps are quite small at the top and pose little trouble for the arms to reach around whereas some rectangular boxes prove difficult for shorter or heavier players. Round backs and stave back models are by far the most comfortable shapes for the widest variety of people. There are many different styles of harps. After deciding on the range and size of harp right for you, it's time to consider the budget.
Small harps are very economical.
As the range increases, so does the cost. Harp making is very labor intensive work and the prices are quite reasonable when compared to other handcrafted musical instruments. Anything worth investing time and energy into is worth investing money into as well. Evaluate your situation and determine what part the harp will play in your life both now and in the future. If you see that the harp will be of importance to you, then go from there to determine how much you are willing to invest.