I should go with at least Office 2010 (we're already 2014 you know, 2007 is 7 years old).
In Office 2010 you can install the PowerPivot add-in if you want to play.
Ideally I would get Office 2013, that way you also have Power View built-in.
Microsoft Excel 2013 stand-alone version
Need an answer? No, you need a question
My blog at https://sqlkover.com.
MCSE Business Intelligence - Microsoft Data Platform MVP