I wouldn't bother with HID into standard projectors, been there done that. Good if you like glare and pencil beams. Better off with thicker wiring+relays and 80W or 100W halogens.
Hahahaha yeah, the "GT-R tax", people are willing enough to pay that much. All about supply and demand.
Have you looked at after market? You will need rails to suit.
If you have projector R32 light then you'll have a bad time. You'll be wasting your time as they will all look similar and the beam will be barely any better.
Wiring upgrade is recommended (run your own relays with thicker wiring for the bulbs). A must if you're going higher rated bulbs.
Or, do a HID retrofit:
(with crappy R32 glass hence the streaks)
I have R33 S2 seats in my R31. Feels about the same width as stocker GXE seats but with more side bolstering.
$800 sounds about right for 33R seats. I wouldn't pay that much for 15 years old seats though.
Look up Nismo sizes/offsets (17x8 & 17x9).
You haven't provided: - Intended use
- Intended tyre size
- Whether guards are rolled or not
- Any other suspension information besides "lowered" e.g. spring rates, camber, castor
Nissan has confirmed the production of the IDx will start in 2016. Engine option look a bit meh though.
http://news.drive.com.au/drive/motor-news/nissan-confirms-idx-production-plans-20140115-30tw6.html
I'm still surprised Hyundai hasn't released their Genesis coupe here. That thing would be selling like crazy.