i think the only benefit to sand that makes it worth while is its look. besides the fact that it looks good and is beneficial to some fish, i think sand is hard to keep as clean as gravel. if you have a lot of plants and or tank decor, it can really be a pain.
as for churning the sand...just do it everytime you stick a syphon in there to clean or do wc's.
sand will mess up your filters and powerheads so i try to keep my intakes well above the bottom of the sand. if you place foam over the intake youll eventualy lose a lot of power from the filter.
i hope you can have time to look into some different types of sand. i am currently stuck with sand in a few of my tanks but have found that one type is unlike the others. im unsure of the brand but if you do want to spend an extra buck, instead of playsand, look for sand that isnt so fine. tahitian moon sand is very heavy and makes syphoning a lot easier. a heavier (slightly larger granules) sand does not pack like fine sand either.