$50k would be the cost to run it un-quantized, 10k could get you for example 4 5090 system, that would run the 671b q4 model which is 90% as good, which was the OPs target
To my deep disappointment the economics are simply not there at the moment. Openrouter using only providers with zero data retention policies is probably the best option right now if you care about openness, privacy and vendor lock-in.
If I was working with sensitive data I sure would only use on prem models.