A 5 speed manual RB20DET 1/2 cut with the front brakes sells for $2400. You should be able to sell your motor + g/box + loom + ecu + afm etc for around the $2000 mark.
The motor physically bolts in, you use the R32 radiator, crossmember, g/box mount, power steer pump. While you are upgrading the motor, I would suggest doing the 4 pot caliper upgrade to the front.
You can't use the engine fan as there isn't enough room between the fire wall and radiator support, so thermo fans are used.