If you are going with a paint grade door, the price difference between solid versus hollow is minimal. I would think that the difference in weight as you use each door might become more of a nuisance. You go to pull a hollow door with the same force that you use when you are using a solid door....I'd do the same everywhere....

Completely agree with Edmond Kitchen & Bath LLC, and for the exact same reason. One doesn't generally give a lot of thought to the weight of an interior door, but mixing solid-core and hollow-core in the same house may amplify the difference between the two.

It absolutely okay to mix hollow and solid core doors within the same residence. It sounds like you have your priorities in line with foregoing the solid core for less prominent openings. If, however, you can fit it in your budget, installing solid core throughout your home will provide more privacy and typically have increased longevity as opposed to hollow core doors. Solid core doors tend to be well worth the added investment overall.

Best of luck with your project!

What's the price differential? I just replaced my doors - mine are solid core and they weren't exorbitant. Frankly, the cost of hardware, installation etc. was more than the door :-).

I had replaced crappy hollow core doors and what a difference in terms of how they feel as well as sound proofing. I was/am still having work done around me and retreated to a room right off where extremely noisy work was being done and it was almost silent.