Ceilings - as W2R suggested - area rugs and upholstered furniture will dampen the echo effect. We did the labor ourselves in de-popcorning... But only after testing for asbestos. We tested positive for asbestos upstairs - and those are still popcorn. (It's super pricey to dispose of asbestos popcorn and illegal to just put it in the landfill.) We didn't have any issues with the ceiling and DH just treated it like any other drywall surface (it was sheetrock under the popcorn)... patch & tape where necessary - then we painted. If you do remove the popcorn - do it before you have the floors done - it would stink to get paint on new floors.
Countertops - have you considered alternatives to granite? We did ours in a combination of stainless steel and butcher block. (Mostly stainless - but butcher on one area near the stove.) I *love* the ease of stainless - there is a reason it is the countertop of choice in commercial kitchens.... so easy to keep clean. If you go this route - make sure you shop around. We found sheet metal shops jacked up the prices when we mentioned it was for a residential kitchen... so we ended up ordering through a commercial kitchen supply place... About half the price of granite.
We went with a nice porcelain in the kitchen and bath - then marble basketweave in the master bath. It's nice to have a touch of luxury - and it's a small enough space that it wasn't too pricey.
Good luck with this project!
I would like a stainless steel countertop for the reasons you mentioned (easy to keep clean and sanitary), but we are already going for a white on white look and I wonder if stainless steel is not going to make the kitchen look too sterile?