I've never driven or owned a base model BA so I don't know what their like (and by the sounds of it I don't want to), but I can assure you (by what you've just said), the XR6T is far better engineered. I've done just under 95,000kms since 2003, I have NEVER, EVER had a problem with it, it is COMPLETELY sound in the cabin which means absolutely no rattles and the ride quality is nothing short of astounding compared to your Japanese cars, I've had a run against a 240kW EVO VIII and beat him down the quarter CONSIDERABLY (with only 20kW extra over him it must be the 883Nm of torque...). I also took the Falcon down to Mallala when it just had a bigger front mount and a Flash tuner and blew away a BMW Z4, R33 GTR (only mods were minor suspension), WRX STi, Two EVO Makinen Editions and an RX7. This was all to my surprise, I expected to be at the back of the pack (For a relatively stock XR6T I was posting 1.22sec around Mallala!). So if you haven't ever driven an XR6T it's worth your while mate, they are the benchmark of Australian performance cars.