This is a really tough question, because none of these works has truly received an audiophile-grade recording. While I don't think you should ever trade off the performance for the sound, here are some suggestions:
If you are looking for an integral set, I'd go with Pletnev on Virgin, or Gilels on EMI. Mikhail Rudy on EMI with Janssons is pretty good, but not in the same league. NONE of these recordings would be considered audiophile. For the first only, best go with the Argerich/Kondrashin on Philips, which has recently been re-mastered. Otherwise, you can try the BIS recording (always good sound) or the two Telarcs (Watts or Guiterrez).
Brahms is equally hard. Again, Telarc has a good set under Mackerras, even if his notions about using a smaller orchestra are not necessarily "authentic" or backed up by an rigorous research. Berglund (Ondine) also uses a small orchestra and it sounds excellent. Other good choices, but again, not audiophile (still sound good, though) are: Bohm (Eloquence) and Klemperer (EMI). You'll be surprised.
If you are looking for an integral set, I'd go with Pletnev on Virgin, or Gilels on EMI. Mikhail Rudy on EMI with Janssons is pretty good, but not in the same league. NONE of these recordings would be considered audiophile. For the first only, best go with the Argerich/Kondrashin on Philips, which has recently been re-mastered. Otherwise, you can try the BIS recording (always good sound) or the two Telarcs (Watts or Guiterrez).
Brahms is equally hard. Again, Telarc has a good set under Mackerras, even if his notions about using a smaller orchestra are not necessarily "authentic" or backed up by an rigorous research. Berglund (Ondine) also uses a small orchestra and it sounds excellent. Other good choices, but again, not audiophile (still sound good, though) are: Bohm (Eloquence) and Klemperer (EMI). You'll be surprised.