Ive done similair mods and weight reduction and with a 4age was around 900kg...
The 4a-gze is meant to weigh around 50kg extra sound your car seems to be about right.
Other things you can do are:
* Light weight wheels/rims
* Optima 6kg Dry cell battery (move to rear of car)
* Replace glass windows with lexan (illegal/unroadworthy light none the less)
* Fiberglass/Carbon Fiber/Kevlar panels (hatch, guards, bonnet)
* Fixed back light weight racing seats
* What juzzo84 said!