Don't just look at 6 core Intels... the top of the line i7 4 core with hyperthreading is right around $300, and has far better performance than any of AMD's consumer CPUs. Which is why AMD had to drop Bulldozer pricing thru the floor; top of the line = around $200. But I would still be willing to spend the extra $100-120 for an i7 2600k or 3770 (right now on Newegg, 2600k is $290; 3770k is $340, with good options in between).

HOWEVER.. the OP is very price conscious and prefers to spend $600 total, in which case grabbing a top end Bulldozer may be good value.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3