The trouble with a question like this is the price I'd be willing to pay is entirely based on security, capability, and functionality. I dont believe any currently on the market offer things remarkably different to warrant a price above and beyond the ~$50 to $100 for a lower end Trezor or Ledger. I imagine in the future features and security may improve to the point I'd pay more, but even then the answer is dependent on the value of the assets being protected.