The SRS light is probably due to removal of the airbags or at least their disabling in order to fit the quick release steering wheel...
I'd continue shopping around -- ideally you want a car that is not only well maintained with low miles, but has either no or only few prior mods like simple bot-on's (unless you are looking for a potential project car, that is...), or if it had been more extensively modded, is either back to stock or has clear evidence of being ready for service to you as DD (again, unless this is primarily going to be a track or project car).
Good luck -- maybe I'll get to see a Z cruising around on Portlandia
