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If you want to spend the money for grid tie with battery back up then why not go for it, it will cost you more but if you live in a country like the US where they measure power outages in days, then it might be the way to go, apparently in Japan they measure outages in seconds per year, so battery back up would just be silly in that case.
either way I see solar as a good investment that can be turned in to an off grid or a battery back up system at a later point and if you have it set up as a strickly grid tied system then you are just saving that much electricity from being produced by other means for you.
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