If the bike suits the deeper section rims then you can't go wrong with Zipps looks wise. I'd drop the Cosmics then, I'm not a huge fan of the look, but the Ksyrium's would look very cool on a matte black bike with their little flashes of yellow:
Shop the Mavic Ksyrium Pro Exalith Clincher Wheelset 2020 online at Sigma Sports. Receive FREE UK delivery on all orders over £60 and easy returns!
www.sigmasports.com
They're not a big brand, and you might have a similar builder local to you, but Wheelsmith build some awesome wheels for a very good price. The bonus is you won't struggle to get freehubs, spokes etc. like you can with some of the bigger brands (If you use their hubs):
New 2019 Stock Rims - New Lower Price!! Zipp 303, 404, 454 NSW & 808 recreation with using the same top-end Toray fibre - just more of it in the places that count!45mm Tubeless Ready Clincher45mm Tubeless Ready DISC58mm Tubeless Ready Clincher with new dimple pattern & "CuttingEdge" brake...
www.wheelsmith.co.uk