Have you tried any drives that will extend their pseudo-SLC cache across the entire space, and then only partitioned 25-30% of the nameplate capacity? That'll get you a terabyte for less than $300.
Personally I've had two SSDs in active use and both have done a lot better than that. One was MLC and died after 13 years, and the other is TLC and still working after 10 years.
Have you tried any drives that will extend their pseudo-SLC cache across the entire space, and then only partitioned 25-30% of the nameplate capacity? That'll get you a terabyte for less than $300.
Personally I've had two SSDs in active use and both have done a lot better than that. One was MLC and died after 13 years, and the other is TLC and still working after 10 years.