Your board is compatible with DDR4 up to 3333MHz speed. 2133MHz is the JEDEC standard for DDR4, and beyond is technically an overclock (usually achieved by enabling an XMP profile in the UEFI/BIOS on a compatible board)
The higher the 'speed' ie 2133/2400/2666++, the more of
theoretical performance 'boost' you'll see.
Depending on the specific workloads you're looking to perform, those may be entirely synthetic (ie benchmarks) vs actual 'real world' gains.
There can be a level of diminishing returns - again, depending on your uses.
2666MHz is usually a 'safe' balance in the cost to performance ratio but, if you're looking to perform any specific tasks that benefit from faster memory speeds - then 3000+MHz may be a good idea.
I wouldn't look blindly at Corsair (unless you have a specific desire to, of course). There are plenty RAM vendors out there and, for the most part; RAM is RAM*.
*Admittedly, there are a lot of caveats to that statement; varying quality head spreaders, RBG, LED etc.
Exactly what I'd recommend depends entirely on your intended uses.
If you're gaming only, 16GB (either 2x8GB or 4x4GB as your chipset is quad channel) would be where I'd aim.
Content creation, 32GB may be a smarter option.
The G.Skill Aegis 16GB (2x8GB) kit at 2800MHz speed is a decent, fairly 'budget' option
https://pcpartpicker.com/product/Kp38TW/gskill-aegis-16gb-2-x-8gb-ddr4-2800-memory-f4-2800c17d-16gis
As is the Patriot Viper 4 (4x4GB) 2800MHz, albeit it's pretty ugly:
https://pcpartpicker.com/product/kNGj4D/patriot-memory-pv416g280c6qk
Comparible Dominator Platinum kits start in the $140 range While they look pretty sweet, I personally don't believe they're bringing much to the table. A Corsair LPX kit (in white) can be had for ~$125
https://pcpartpicker.com/product/6ntWGX/corsair-vengeance-lpx-16gb-2-x-8gb-ddr4-3000-memory-cmk16gx4m2b3000c15w
And, if you're looking for LEDs you can get into that for ~$127 or so
https://pcpartpicker.com/product/PxH48d/corsair-vengeance-led-16gb-2-x-8gb-ddr4-2666-memory-cmu16gx4m2a2666c16r
Dropping down to 2666MHz for the priviledge though.