I've always heard not to mix brands, but what do you all think about this? Or should I just spend the extra $200 for the PPG products?

They say dont do it.I do it.a lot of people do it.If you let the primer cure good you should be ok,but if there is a problem,your on your own,because everyone will say they told you so.In the past i have used,Mar Hyde 2k prime,dupont basecoat,and many differnet types of clears.just make sure you dont mix brands of activators.i mean dont put PPG activator in Dupont primer.

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70 chevelle,400cid turbo400.blue with silver stripes.
www.members.spree.com/entertainment/ochrisl/

I sold paint for four years and I will tell you technology is technology, it won't hurt a thing to spray different paint over the PPG primer.

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1965 Buick Gran Sport Convertible
1965 Buick Skylark H/T
"Fan of most anything that moves human beings"

Thanks!