My feedback, from behind my screen ofcourse

ELVES 45c 1050g NO BARS 850€ => it has a strange geometry (very low), not many reviews out there.
VELOBUILD 50c 1020g NO BARS 500€ (!!) => best bang for the buck, looks aero/modern, many happy riders
WINSPACE 50c 950g + BARS 1500€ => it appears in reality the frame in M is around 1200gr. Customer experience with Winspace is hit or miss.
Quick Pro 45c 950g + BARS 1700€ => beautifull aero frame, lightweight and the brand has a great reputation, borderline expensive though.
Mondice 50c 1100g NO BARS No Aero Seat 600€ => not an aero frame set, geometry is more for adventure IMO, ideal if you ride on rougher terrain.
Other valid options: Ican Graro. the frame looks aero, sub €1000 , ICAN makes quality frames.