Depends on what style you are going for and how much you are looking to spend. As mentioned, there are several OEM options such as the Nissans, 20" Chevy wheels.
FYI you can also usually find the UGLY chrome clad Chevy 20s for cheap, bust the plastic chrome off, and there is a decent looking wheel behind it, that just needs a little paint or polish.
This
To this:
Gives a nice flush "tuner" look, those were of course painted black. They are raw aluminum when you pop the cladding off.
Or there are some nice billet options, and they will drill pretty much whatever bolt pattern you want into any wheel.
Such as these Racelines
or these Intros
I intend to go with the Raceline Speedster 5 spokes with 6 lugs for my 67 C10, I want to keep 6 lug to retain the ability to swap for my stock steelies and poverty caps when I want to change it up.