New office design, Nexus core?

Moving offices soon and looking for opinions.

Currently have dual 6509s, some 4948s and stacks of 3750s at the access layer. All of this was done new roughly 4-5 years ago so its not old, but given the chance to buy new (CISCO) equipment what would you do? Would be a single building/floor or two floors at most w/2-300 users. Recently did a flex pod design in our DC using 7ks, 5ks, UCS but that would be overkill for an office this size. Read some opinions on 5ks at the core but people seem to love or hate that idea.