Hi,
In my view you can look into to main opposition:
1st option -high-end builders and designers
Mugen kites (https://mugenkites.com/), Benson kites (http://bensonkites.com/), CKD kites (https://www.canvaskitedesigns.com/), Level one kites and others.
2nd option - Open Source high end kites
Choose one of the extremely well designed open source kite (plans that were donated for free use by to top designers).
Go to the Karel Oh website for details (https://www.kareloh.com/)
You can build by yourself or ask me or other builders to build for you a full kite or just a sail (you can frame it yourself). We all build as a pure hobby and at material cost.
If you need more details as to any of the options please feel welcome to PM me.
Daniel