I went the RB25 gearbox route and it run me close to 4k, but that was with someone else going the installation. I'd recommend you stick with the Z32 box, my reasoning is with the remote shifter it moves the shifter slightly back and puts it in a nice spot. The rb25 box puts it more or less in the stock location but tilted more towards the driver, also makes your shifter boot difficult to fit and as yet I haven't got off my arse to fix it, so I can see the tunnel through the console. My rb box was 1500 but nowadays they are down to the 1200 mark. And obviously to make it work with current available adapter plates, you require a Z32 bell housing anyway, unless you want to drill more holes in the bell @_@. The rb box is MILES better then the old zed box, but not as tight as I'd like it to be, so I'm gunna install a short shifter and see if that band aids the feel. First gear feels ultra short as well with 3.54 diff in, but second gear is sweeeeeet RB25 box is also meant to have better synchro's then the z32 ones