>>3079382"not over the top"
to some people this means $250 lenses, to others it's $750 lenses. Money is subjective.
decide what direction you want to go with your lenses, stick to primes or a set of pro zooms, latest autofocus or will old manual focus stuff actually keep you happy.
Personally, I'd ditch the nex 5 and get either an a7 (if autofocus isn't important at all) or the a7ii if you want more of an all-rounder. The larger sensor will give you more options for wide angle lenses, have better low light performance, build quality is massively improved, the evf is magical and you will have sharper images with smoother bokeh.
Lenses, that's up to personal preference.
Pay a lot and get the Sony GM stuff
Pay less and get the Sony mid range primes (28 f2, 85 1.8 and either the 50 or 55 1.8)
Pay very little and get old manual focus shit (you get what you pay for with older lenses, there's no such thing as a "bargain" vintage lens)
Hit some sort of midground with a sigma mc11 (only if you have a7ii/a6300 or better) and older canon L glass, the 70-200 f4 non is and 17-40 L are incredibly cheap if you ppick up a good deal.
That's the joy of Sony, there's something with good performance for every budget.