My Surface is also 32gb (which is actually 28.9gb after formatting and such). I moved the recovery files off to a USB thumb drive which left me with 16.4gb free out of that 28.9gb. I further moved my Documents, Downloads, Music, OneDrive, Pictures, and Video folders over to a 64gb SD card so that the 16.4gb free exists solely for system stuff, updates, and Store apps.
If the 2520 supports SD cards, the 32gb model at that price is a screamin' deal.