You should specify if the listed budget is for frame and fork or full build.
I ride a Fairlight Secan which is an 843 main frame, shaped 4130 stays, and a carbon fork. The fit and finish are excellent as they should be with so much design and thought put into the frame.
Fairlight's Faran uses 631 for the main triangle and fork, and shaped 4130 for the stays.
What I appreciate is that they list each tube's butting. They don't act like the bikes will be incredibly light and you can see the details, which is way more revealing than most any other production brand.
They offer a ton of sizes, 650b works fine, and the bikes are easy to work on by design(external cables).
If either frame interests you, take the time to scroll thru each frame's lookbook to see all the design and features.