Couple items..
final primer color will drastically effect the tint on the base coat or single stage.
I would take a panel and tape off separate areas and use different colored primers in each one.
put the tinted base or SS over each and see which you like best before priming and painting the entire car.
fwiw just about all liquids have gone up 50%-70% since COVID happened.
And as mentioned above - DO NOT CHEAP OUT on them.
The better products do a superior job with tinting to match production colors as well as durability (UV etc..)
PPG did MOPAR paints and match well.
DuPont (Axalta Coating Systems/ChromaBase) did all GM and and match well.
these two cross well between car manufacturers from the 60's and 70's
its probably around $2500+ at least, on liquid costs to do a complete car now. This includes, primers, base/clear (or SS), reducers, hardeners, sealer (epoxy).
Buffing/polishing compounds and wet sandpaper.