stevieh,
not sure where your getting your prices from for the supercharger kits but you will be looking at more than the figures your quoting. kits will be 100% fully comprehensive unlike some other kits out there meaning it will include management, loom, supercharger, brackets, bost pipes, intercooler, manual throttle adapter kit, full idle control, all clips bolts ect.
as for the aircon kits...unless people show genuine interest down the line i doubt it will be available as its would be very expensive (in the region of 5.5-6.6k) and its allot to gamble on having very expensive bracket sets made just to sit on the shelves for years gathering dust.
but results and prices ect will be available in 2-4 weeks for the non aircon kits. please take your time to research currently available itb and turbo kits though if you want to go that way. speak to as many customers as you can who have various kits fitted and make your own mind up on where to buy and what route to take regaurding hardware and electronics ect.