It’s a mistake to rule out a modified Denon 103. I have a 103R that Andy Kim modified with a boron cantilever and MR stylus. It was a massive improvement over the stock 103R. It sounds great and has excellent tracking. Quite a bargain in today’s over-priced cartridge world.
All of the 103's that I have heard distorts the high frequencies. All of the cartridges I have heard with "upgraded" stylus/cantilever assemblies do the same.
I would have gone this rout with my Signet if this wasn't the case.