You can't buy batch 8, because the start of the Chinese New Year festival.  It would basically be a rush to get the payment and have them ship it out to you by tomorrow morning in China (Feb 3).  I would recommend just go ahead and buy batch 10, and save the money - with the expectation that you would receive those the shipment sometime in the 3rd or 4th week of Feb.

I'd be hesitant buying these from resellers for now.  Of the S7 I've ordered, 1 in 4 have had some sort of problem.  If something goes wrong, it would be better dealing with the company rather than a reseller.

For dealing with the noise, I did:
- add 3 feet of flexible ducting on the front and back fans (see the posts from philipma1957 on this subject), and covered the actual units up with a heavy blanket
- set the fan speed lower (my environment is very cool, so I am able to set the fan speed to 30%, and still run the servers around 40 to 50C)

You can get a sound meter app on your smartphone to see how much of an impact any changes you make have on the actual noise produced by the machines.