All assuming GOOD condition, No major defects and looks nice, feels nice, smells nice, runs nice. Price is what I'd say they worth:
BMW 1991 318i $2700
BMW 1990 325i $3600
BMW 1988 CONVERTIBLE (not much info) no guess
BMW 1988 325i Red convertible $3600
BMW 1988 325I CONV'T Silver-blue $4200
BMW 1987 225E (should be 325e) $2700
BMW 1987 528e $2400
BMW 1985 635csi $2900
BMW 1984 318-i $1200
BMW 1981 633 CSI $2200
BMW 1971 2002 No guess (but $2800 is too high unless show car quality)