I know we're one of the avionics companies so we're biased, but:
As others have said, the concern over the cost of "glass" avionics is probably a false economy.
The Dynon Avionics Kit from Vans is $13,995.
In this is a com radio and a transponder. Unless you are planning on flying only out in remote areas, these are requirements in any airplane. You're looking at $4,000 for these two items if you go another route. Plus, the kit includes all the wiring, and antennas. So $4,500.
Also included is an ELT, which is required everywhere. Additionally, an intercom so you can talk to your passenger, again, all with wiring and antennas. Easy $1,500 there.
The avionics kit also includes all your switches, wiring for the whole plane pre-made, and fuses needed for things like the alternator, flaps, and lighting that has nothing to do with your avionics choice. So another $1,000 there.
So $7,000 of the $14,000 is stuff you will have no matter what your panel looks like.
So really, your "avionics" are $7,000 with rough math.
You can likely get away with just an airspeed, altimeter, compass, fuel gauge, RPM, coolant, and a few more gauges. In the end, those are going to cost you at least $3,000. They are also going to take you a lot longer to install because they aren't plug-and-play like the avionics kits are from Vans.
So in our math, you're looking at maybe a $4,000 delta for a full glass panel against an extraordinarily basic panel, that doesn't have a DG, attitude, VSI, moving map, fuel computer, etc.
While $4K is far from nothing, it's also far from $14K that you may be thinking you can save. Consider the additional functions of that $4K (like a moving map with no subscription costs), and the resale value of the plane, and it's really a lot less.
Finally, you might just fly on the same day, given the extra work and time that will be required to hook up all this stuff in a custom panel that Van's doesn't support. You'll need to make a custom panel, and do all your own wiring, find your own switches, fuses, and more.