If you are talking value for money, in terms of performance, i will still most definately buy a Jap car. I made this decision 4yrs ago and my resolve has only gotten stronger.
How can Austalia's best attempt at a performance car, whether it be Holden or Ford, even compete with Japan's 15yr old R32 GTR.
At today's prices you are looking at about $70k for either Holden's or Ford's best car (if not more). To buy a great condition R32 GTR, fully modified, yet still street drivable, the most you would pay would probably be about $45k. And believe me, $45k is considered very high for a R32 GTR, so the car would have to be mint and HIGHLY modified.
Last i looked, XR6t were not so cheap to modify. The ecu is very smart and only a couple of aftermarket piggy-backs are available. The g/box is also considered to be weak, and other issues also have to be overcome.
On another note; i truely beleive the build quality of the Aus cars leaves much to be desired. They aren't as bad as the US though.
Just some of my background:
I still love going to the SummerNats, almost every year. I also attend most Ford days, in Geelong, and appreciate the level of work and performance ppl have done to their car's. Basically i am not a "Jap is best because i own one" person