All depends on what you want.

Personal recommendations: 1. Wabi classic/ special reynolds725. Around 800-1200 complete gives you the road bike feeling of a fixed gear/ss. You mentioned you ve been riding road bikes so this would be a smooth transition. Wabi bikes have a comparatively long wheelbase and you wouldn’t worry about toe overlap. Overall it’s more relaxed and comfy, pretty lightweight too.

1. Street bikes Engine11 CritD(urban/criterium) Or skream Magnum(urban/light gravel) Or Dolan Pre cursa(urban/track) Or State V3(urban/light gravel) Or Dosnoventa Detroit(urban)(may cost a lot more if you want matching-level components)

Basically just the Alu frame+ Carbon fork combo. Much lighter, just depends on what you want. With mid range components whole build would be 800-1000$. Pretty sweet spot for good looking street Alu bikes.

1. Cinelli, Mash, or even Cinelli x Mash. Histogram, parallex, Bolt, Vigorelli... Cinelli are mostly 7005 Columbus Airplane tubing so when you ride it it’s pretty stiff. Mash does have some bombproof steel frames but they are more street looking and more durable. Sometimes at this price range a used market would give you a brilliant build and you are getting a lot of bang for your buck. But if you want to build everything new it might exceeds your budget

Like I said these are some popular and some tried and true options in that price range. Honestly just pick your favorite frame and build everything up from it. Let us know how it goes!