Your 2007 documents won't be upgraded but you will be able to see and edit them in 2010 or 2013. If you can still get a legitimate copy of 2010 (I haven't seen one is several months), I would recommend it over 2013.
Samsung 128GB 840 Pro SSD (1),
Samsung 4TB 850 EVO SSDs (4)
Samsung 4TB 850 EVO SSDs (16) external backup drives used in 2.5" hot swap bays in the computer.
PSU
Corsair HX750w
Case
Antec Two Hundred v2 (modified)
Cooling
Cooler Master GeminII S524 120mm (fan replaced with a 140mm)