Wondering how much I should offer for my friend for his civic.

specs

1996 Honda Civic EX
190k on body 100k on jdm d16 engine
Forged Internals
Alch/Meth Inj Kit
Seibon CF Hood
MSD Blaster Coil and Ignition
Greddy Td06-20g Turbo
FMIC
Greddy Type-S BOV

The Bad
3rd Gear Grinds if shifting below 3k (no idea what this may be)
Bad knock sensor circuit reading
Bad O2 Heater Sensor circuit reading
Exhaust leak (this may be the reason for the 02 sensor light)
Pass window rail is bent (common in 6th gens?)
Dings on the body

How much should one pay for a car like this based on the above info.