Who doesn't love a completely arbitrary TCL challenge?
Here's the criteria
The car has to be over 20 years old.
Budget for car + maintenance/mods/refresh is $20,000
So what does this leave you with? An old, probably ordinary car, but a good amount of money to do a refurb of some sort.
For me, I love E34s, specifically the pre-refresh with narrow grilles.
S52 Swap + various mechanical/suspension refreshing: $10k
OEM+ wheels, interior bits, details etc: $6k