do some research and learn ur car better.
caster rod bushes, round the $100 mark for urethane, bit more for adjustable ones, $40ish for getting them pressed in, do the labour of putting them in and out urself, pretty easy job. radiator, once again do the labour urself, radiator will cost u $100 from a wrecker, spend another $100 to get new seals and get a flush for it. hoses, depends what u need really, paint job u can do urself if u have a compressor and spray gun, or u can do the sanding urself and take it in and get the painting done pretty cheap, but really, its not a necessary thing, same as the scratch etc. wheel alignment, $40-$80 depending on what u get done, and what adjustment u have. new tyres, well if u look around u can get decent tyres for pretty cheap 2nd hand, ive got a few near newies up for sale, or even just some with a bit less tread, looking around the $200-$300 mark for a set of 17" tyres, depending on how much tread and what type u want, looking at about $40-$60 for fitting and balancing if u dont know any wheel fitters personally.
hrmm...
$140
$200
$60
$250
$50
roughly $700 to get her nice and good again. and belts, well if ur with the RAA, id buy the right belt, cut the f**ked belt off, call RAA and say yep, one of my belts has snapped off, heres the belt for it (they wont carry belts for skylines) say u knew it was going and ud bought one ready to change them over, but it broke before u got a chance etc etc, get them to install it and wallah, free labour!!
saying that, check the tension first, it might just be loose and spinning on the pulley.