Why not buy a V35 Skyline sedan? Basically the same car you have but with 4 doors. I was in the same boat as you about 12 months ago when my Missus got pregnant and the old R32 Skyline wasnt exactly suitable for a baby seat. I was looking at either a Toyota Chaser, Toyota Aristo, V35 Skyline 4 door, Mitsubishi Legnum, or an EVO 7-9........ Clearly im a fan of imports but my current car became available from a workmate at a price I couldnt refuse, Having said that I regularly wish I had of got something that also Brakes and handles instead of just making power. (but you already owned a XR6T so you can make your own mind up there) Mines a ZF 6 speed and I dont find the driveline to be an issue.