I haven't heard about 2010 being a major new step in Visual Studio releases (I could be wrong) so my opinion is not to worry about changing it if you already have the 2008 version - especially if your goal is learning the fundamentals, you should be fine. Of course, there's nothing wrong if you do get the newest version of VS! You can also use the Express Edition for free - but it's nice to have the office tools if you are interested in Excel.
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