With the OS88 6 speed sequential, bear in mind that there is a 2 to 3 month wait on them ex-OS Giken as they only put them together after they have been ordered (and paid for).
I like what you are doing with your 3.2L build. Should be an awesome street car.
There is a guy on here in Perth with the forum username "chavey" who has already completed a similar build to yours in his R32 GTR but uses a GTX3582R turbo.