man, i think if you have some money to blow you should buy Serprise in WV's setup...comes with a drilled and tapped intake manifold for direct port nitrous...comes with everything you need...check the for sale forum..
NOS is the brand, nitrous is the chemical. Just had to make that point...
That being said...I prefer NOS brand nitrous systems. GREAT quality, GREAT help through their tech line (for jetting, etc.). I've never had one component fail me.
End of shameless plug for Nitrous Oxide Systems, Inc.
(Edit) For a turbo setup, I'd suggest a setup that had a RPM Window Switch (NOS brand makes one, don't know about the others). It turns on the nitrous at whatever rpm you tell it to, and shuts it off at whatever rpm you tell it to. That way, it could be used to 'bump' the turbo up a bit, help it to spool up quicker, then shut off.