hey Shaun, hope all is going well with the car. its funny to read you doing almost the same thing as me 2 weeks ago. My GTR has a little bit of rust in the back behind the rear wheel too. I also have a slightly crushed rail, which i think is from bad jacking by previous owners. I hit my car with the rainex rust convertor and then a bit of underbody sealant, the brush on type to make it tidy underneath. I took my kit off too to fix all the clips that hold it on and replace most of em. I have a GReddy oil filter relocation kit with oil cooler which is handy.
Have a look here for rough prices, although this one is for a 34
http://www.modyourcar.com.au/product_info....roducts_id=3414
Also try J shop or X speed for prices.
I think your N1 rear wing looks good, leave it on, but if u hate it I'm sure someone on the forum will grab it off you, maybe even me
I've only been on the forum about 3 weeks myself, having only got my GTR 2 weeks ago, but its great for info and handy tips. I have bought a few things off ebay for my car too, just trim bits and bobs, it pays to keep an eye on there.
Good luck and happy GTR'ing