This is a deceptively complicated question, because it depends on your power needs, how many solar panels you can actually install, your location, etc. At this url, however there is a very handy chart that shows you the average DC output provided by different panels and their cost per watt as well. The Canadian Solar CS6P-210 or the Suntech STP210-18/Ub-1 might be your best bet due to their relatively low cost per watt and decent PTC rating (which is the panels rating under realistic test conditions). Again, though, this is very dependent on your own power usage and your location, so you should have an expert come see your location in person so they can determine the best choice for your specific needs.
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