If the Black Gates are just the standard series and in the PSU, I would just replace them with something Panasonic in the right form factor. Something like Panasonic FM if standard radial. You probably won't be able to chase down BGs, and if you could, pricing will likely be insane. I personally don't think they are that good anyhow, and are an 85°C cap anyhow, ve. 105°C for good Panasonics or Nichicons. You might also replace the PSU rectifiers with Shottky as well. I typically use 11DQ10s or 31DQ10s for higher current applications.