All of those are equally good flutes in terms of quality, but you really need to play all those flutes and decide which one YOU sound best on.
I just bought a flute right in the same price range, and I actually tried all of those flutes. I sounded great on all of them compared to my old flute, but I sounded SO good on the Yamaha, well I sounded great because of the headjoint. Instead of the Pearl Quantz, I'd look at the Dolce and Elegante. When I tried a Quantz (765) my tone was INCREDIBLY thin compared to the Yamaha and the Miyazawa. I didn't get the Miyazawa because my tone was a little more airy and just not as good. I even tried the 402, with my choice of headjoint (M5) and a gold riser.. A $5000 flute, I still sounded MUCH better with the EC headjoint.
The flute I ended up getting was a Pearl Dolce CODA because I wanted the C#/D# roller. The C# trill is now standard on Yamahas 500 and above), and bought an EC headjoint for it
I sound wonderful on it, my teacher comments on my tone every single week, haha.
Definitely try out all those flutes