Take a look at the FoxEdge The Claw. Fits your price range. For fixed blades, the previously mentioned Cold Steel Tiger Claw is probably the best one in that price range. Depends on what (if anything) you are going to actually do with the knife. If you're willing to think about a straight blade with a ring (gasp, clutching of pearls), you can justify your crisis as "upgrading my urban maneuverability, transitioning to non-pants-dependent personal storage system, and integrating a safety device into my sensible EDC, Your Honor."
Seems like $100-150 is the barrier to entry for fun fixed blade ringed knives, curved or otherwise. Spend some time browsing on Karambit.com to see a good (but not by any means complete) range of styles, makers, and choices.
Tops Devil Claw
Tops CUT
Boker Accomplice
Combative Edge Dragon Tail