I find with experimenting that many times I need more than one PS. So I have PS's that do:
5V @ 1A (for general logic circuits)
9V @ 1.5A Wall warts to power circuits that have regulators on board
12V @ 500mA Wall warts
0 to 15V @1A GP adjustable
+/- 0 to 25V @ 0.5A (for op-amps and other analog circuits that require two rail Voltages)
13.5V @ 10A (Pb acid battery substitute)
Plus will use 12V, 9V, and AA series batteries as needed.
Only the adjustable dual Voltage supply seemed expensive (>$100).
I built the 5V, 1A which uses an LM7805.
and the 0-15V which uses an LM317.
My point is that there isn't just one power supply that does it all.
Another pint is that, it is not a great idea to use a supply that can deliver 100V on a circuit that has a max of 5.5V. It is just too easy to turn the adjustment too high and let all the magic smoke out of the chips in your circuit.
That is another reason I use LM7805 type supplies, they have 1A max current and a fixed output Voltage.