The greddy kit is nice... cause you should get everything you need including a piggy back (blue box) that will run for the time being, as long as they also give you the right size injectors which im not sure if they do. The only thing that sucks about greddy kits is that there wastegates are internal instead of external... so basically there a great starter kit but will cost more to change up down the road for more boost.
If you dont have a list of what you need... here is a run down... hope i dont miss anything.... keep in mind this is for a safe set up.
turbo (your choice on size)
manifold (depends on car)
bov (dsm to hks to turbo xl... just make sure to get the adaptor for the piping)
piping
intercooler (hell it dont matter.... i had one that was three dsm welded together)
wastegate (varies if you are internal or external - tial is good for external)
down pipe
fuel system - injectors, fuel pressure regulator, fmu (but wouldnt suggest it), a better fuel pump if you can afford it.
Spark - msd 6al, external coil, cap w/ external coil application, good plug wires
Guages - boost is a must, highly suggest oil pressure, egt is nice but not necessary, air/fuel (but dont get autometer - get one from hondata or anyother real time reader provider)
ECU - the heart it all... E-manage or aem or my personal favorite hondata - cheapest other than uberdata.
and last but not least.... an extra set of tires... so you can do some kick ass smoky burnouts !