Hi Evgeniy,
I don't think there is a general recommendation, but the recipe is quite simple. Take for a start really huge cbasis and then remove functions (or optimise them with the cbasopt script) while monitoring the errors.
In your case, I would say you could set up a small model system and start with the aug-cc-pV5Z cbasis, then go down to aug-cc-pVQZ and aug-cc-pVTZ. If the error with the TZ with respect to the 5Z is acceptable, then you are done.
Hope that helps,
Arnim