FWIW.. Couple things come to mind.. since I have built three times...
Have all your floorboards screwed down vs nailed...
Squeaks are the result of nails moving up and down.. and when the boards alter shape.. squeaks start... not so with screwed down boards.. and once the carpet or flooring is down.. try to fix a squeak...
Add insulation to some of your inside walls.. like around bathrooms... they'll cut off sounds.. and maybe around some pipes too... will deaden or quiet the sound of water running thru them
Consider a second floor laundry room... I have not done this yet... but sis-in-law did in Columbus.. wreaks with sense since that's where the majority of the wash comes from.. avoids the trek up and down stairs...
Not sure it's possible to have too many outlets for electric and cable... more cable outlets increase room flexibility..
Rules of thumb are.. kitchen and bathrooms are so key.. money spent in those areas have higher paybacks than any other areas in the house... knock yourself out here.. I love my granite tops... they don't scratch.. they don't discolor... and you can put any screamin hot item directly on them.. and no problem...
Whole family is addicted to ceiling fans... that make NO sound whatsoever (Hunter's a good brand)... every bedroom has 'em..
Have a mud room.. somewhere you and/or the kids can come in the house.. and peel... mud and all... might be great if there is water/sink nearby or in the room..