With that kind of damage, saving money should be the last thing on your mind. This is not the kind of damage that you can fix in your own garage in your spare time. That car needs a frame machine, because you can bet the suspension mounting points have been moved in the accident. I'd be surprised if both doors still open and close as well as they did before the hit. Look at what is obvious: needs new quarter, new taillight panel, judging how far the bumper is pushed in, it needs a new trunk floor and rear subframes and who knows what else is kinked. The parts I mentioned are all structural parts (yes, even the taillight panel) and if even one is out of whack the whole car is out of whack. Unibody cars don't take such hits without wrinkling pretty much everything, and I wouldn't be surprised if the floors aren't bent as far forward as the driver's seat. Remember your high school physics class? For every action, there is an equal and opposite reaction, and that means if you were sitting in the seat when the wreck happened, the seat was trying to bo backwards and since it's attached to the floor by four bolts, those mounting points may have been compromised. Take the car to a good frame shop and have them shoot it to see how far the damage really goes before you decide on the correct road to take next.