I personally am not a fan of considering phones over $300 w/o consideration of the rest of the chain. From my experience one really needs to consider their system as a whole. It's also not just a matter of 'fixing' things but truly getting the most out of your drivers capabilities. Plus certain aspects to a FR can have other attributes other than sounding dark or bright. I think this is really a more complex topic than has been delved into so far.
I think some are also under the impression that if you spend more money on phones your choices become easier and problems evaporate. Quite the contrary. You don't buy a Ferrari and expect to service it at Jiffy Lube or put $50 tires on it.