Ok.. Honestly:
1/3 of me wants a six speed box to be different.
1/3 of me just wants a six speed so, as you said, "I have a six speed box" blah blah blah... Still, I'm not the bragging type, so this for me is a rather "niether here nor there" affair...
1/3 of me actually needs it, I do bucketloads of country driving, now, I refuse to sell my R34, I love it to bits. I cannot afford a GTR and on that note, a GTR isn't really practical for my uses... sitting of 3000 RPM on the speed limit between my place in Perth and my farm (360km) eat the juice like mad.. Now I realise Skylines will never be frugal fuel misers, but it would make sense that I would be using less fuel if I was doing a few hundred RPM less... A 'cruise' gear so-to speak....
I guess it is partially a desire to be different and a dash of necessity, no point me lying about it....
Can you get a 6-speed gear-set for the GTT box? As opposed to resorting to a full blown gearbox transplant???