Chris:
As a recent plane buyer (a 1975 C-150 Commuter) I more or less agree with all of the previous comments.
I have a King 125 NAV/COM which came in the plane when I bought it. No glideslope, but it will track VORs. You have to go one or more steps higher (the King 155) to get VOR and glideslope.
VOR and DME equipment, although still operational, are probably going to be replaced by GPS-based systems. Maybe not immediately, but in the five to ten year range, I would guess.
I would seriously consider up-grading to TSO'ed GSP equipment.
GPS approaches already exist for a number of airports.
I came to flying about the time that Loran and VOR was de rigor as the latest electronics available, but GPS is the wave of the future.
I would suggest that you read some of the prior posts in this sub-section.
For example, take a look at Jim's H.'s panel, which is pretty much state-of-the-art, and merges position location, range distance and bearing, and even Collision Avoidance information on a single display.
Good luck finding a plane. Avionics are relatively important, but the plane you eventually get will have some, and you will probably want to up-grade and/or modernize anyway.