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Windows connect you to outside world, and can be one of the most important and widely under-stated feature driving the energy bills in your home directly and indirectly (AC and Furnace performance, and whole house cooling and heating loads). When choosing between different options, we(SmartZeroHome.com) would recommend focusing on the following to pick the windows that best suit your home and your needs:
Our 'Intelligent Designer' software specifies the exact SHGC and U-value for a window, that is best for your home
Based on the above considerations, you can zero in on the best products that meet the above criteria.
Also see our post on Windows Installation and on the Windows 101.