I have the same concern. I have around 1.3-1.5 USD, I'm looking for a lightweight frameset, I already have an aero bike - Elves Falath Evo. On the table I have: Ican FL1, Winspace SLC3 and Elves Vanyar. At the moment Winspace has 60% of my votes, but I'm still thinking, it's the most expensive. The SLC3 is also the lightest, probably the best build in general, but I'm not sure. FOr the SLC you can have additional 10% from some of reviewers from Youtube. I reject the bigrock, it's not looking very good for me. On same Czech forum, I found Ican, looks really nice, around 6.5 kg in size M.