I need some help picking out a diecast model.

I'm looking for a gift for my brother. I'm thinking about a diecast 1:18 scale car. Either a Porsche GT2, Carrera GT, or a Lamborghini Diablo. I saw some on ebay that were made by Auto Art. Are these really twice as good as some of the other "cheaper" diecast car companies like Maisto.

And where can I find some inexpensive Auto Art diecast cars? The cheapest I have found are $50.

of that list, Id HIGHLY recommend picking up a Porsche Carrera GT. I have the silver one, and its a high quality heavy model with EXCELLENT detail.