280zx or 300zx

Have a huge dilema I have a 82zx chassis and good condition hardly any rust already strip down just doing the body work myself it needs body work and paint and i have my original 82zx that`s where all the parts are coming from to put a car back on the road, Here my dilema I came across a 86 300zx that`s in good shape but needs a transmission I check this car out it just needs the tranny the guy wants $700.00 for the car as is I`m pretty sure I can talk him down to $500.00 and rebuilt the trans and be back on the road with a zcar under $1000.00.tell me what you guys think ................thanks Juan