The hks won't work without modification I believe. Ive seen and installed one. The big bracket that hangs the charger and pulleys is made for a motor without variable exhaust cam. It bolts right onto the front cover there, so I'd bet that you'd have to make a new one or modify it.
The other thing you have to worry about is your direct injectors. Who knows what capacity they are, and if they will safely support the extra fuel needed for a s/c. It's not like you can drop injectors in easily, with aftermarket support. And find a ecu to work.
Have you priced a vq25det motor? I know it would be very difficult to wire in, but it should bolt right up to your gearbox, or you could use the box that comes with it without the front shaft, or even a 5spd from v35 or 350z will go in, or a manual. It's just a matter of getting everything to talk to each other. You'd get a motor for the price of one of those kits.