I am still using Excel 2003 to automate a bunch of trading stuff and I am very happy with it (My IT isn't but it is what it is...).
By happy I mean that I understand its limitations and over the years have become very efficient at getting around them and getting Excel to do almost anything I want.
I write plenty of VBA and C++ for Excel and acknowledge that I am pushing against the limits of what this (excellent) tool was designed to do.

I din't migrate to 2007 for 2 main reasons.
1) The brains at MS changed all the menus and short-cuts (I hardly use the mouse in 2003)
2) The charts were unacceptably slow to render for my needs

At the time I felt strongly enough about the above that I didn't waste time investigating any further what other nasty surprises 2007 may have had in store.
However, we are now in 2013 and with MS abandoning support for 2003 next year, the time may have come for me to bite the bullet and choose the next Excel version to put through its paces.

But which is the best Excel for traders and/or quants? 2007, 2010 or 2013.

Please forgive me if this topic has already been covered elsewhere. My searches haven't had much success so I thought I'd post this. I'd be happy to be pointed to relevant previous posts if they exist.

Thank you all