I'm not sure about the thread, but these are the main brands people here use:
Winsor & Newton series 7 Miniature
Rosemary & Co. series 33
Da Vinci Maestro Full Belly Round or Miniaturist series
I personally use the Series 33 exclusively these days. They are the same quality as the other two brands at significantly lower prices.
A set of 5 Series 33's including sizes 1, 0, 2/0, 3/0 and 10/0 runs about $28 plus shipping.
Da Vinci Maestro's for the same sizes run about $71 for the full belly rounds, and $52 for Miniaturist, both before shipping.
W&N series 7 Min. run $43 plus shipping, and that doesn't include a 10/0 as they don't offer one for that series.
Those prices are according to the Rosemary & Co site, and the others are from Dickblick.com who sells them lower than their msrp. Some places charge $17ea for the same brushes I mentioned here.
One reason R&C is so cheap is because they only sell direct. CMON carries a few of them, but they are marked way up from what they cost on the R&C site.
My references for prices:
https://www.rosemaryandco.com/index.php?currency=USD&cPath=275_365&osCsid=oclrj0fce1qv9eo69obblav9m7
http://www.dickblick.com/products/winsor-and-newton-series-7-kolinsky-sable-miniature-brushes/
http://www.dickblick.com/products/da-vinci-maestro-kolinsky-brushes/