The first criteria is to buy something you will enjoy. And full enjoyment of your new furniture means considering your taste, your lifestyle and, of course, your budget.
Taste is entirely a matter of personal preference.
You may delight in the traditional elegance of 18th century styles or be most comfortable with the sleek look of contemporary. It's strictly your choice. If you're not really sure about your design preferences, look through your favorite magazines to find rooms that appeal to you. Even better, browse through the furniture selections and displays at your local home furnishings store where the staff will be happy to help you find the furniture that's right for you. Choice of style depends on you, but your lifestyle should come into play when durability is a consideration.