i woudln't bother with the money involved for a transmission swap on a car like the kizashi. keep the mods on the 370z (assuming you still have one...i think?) and just use the kizashi as your daily driver. just dont' be in a rush
btw, kizashi is a retarded name. kizashi means 'sign' or 'omen'. omen of what? ur car breaking down soon???