I didn't really need 1000 but the price was pretty cheap so I said what the heck.
If you are using 600, 1000 is the quantity you should go for. Those looks like from 4UCON. I got those (straight instead) somewhere else cheaper than 4UCON. I think for parts like connectors & passive components, you have to bite the bullet and pay upfront. Like for example, I have about 15K of connectors just for the osPID project I'm working on. That's a lot of connectors I guess for a small shop like me.
And some advise for buying from China, get your samples in first before bigger purchases.
On the pool purchase, there might be more than 1 guy going for the reel!