my take on this is that why wouldn't you buy the best even if it's a piddley $20-$30 bucks?
every true reef of 55gallons has to cost at least four grand if you really do it right. i understand there are areas (like kc) where you can get'er done for a couple hundred with friends. but honestly why skimp on something this trivial? this is say forty to a hundred bucks to save how much in corals and it lasts pretty much the life of your tank.
there are people that say use any old sand. usually turns out to be the people that own less than quality lfs, but hey to each there own. go with good stuff or do the cc thing if you want to, but just think about a saltwater tank with yellow play sand. i hope your cat doesn't get up there lol.
i personally always will go with carib-sea sugar sized aragonite. not a brand preference or anything, but it's what i started with and it looks better than anything else i've ever seen. i recommend you take a $3 bag of play sand, buy it and bring it in to the lfs to compare. looks a bit different under high quality lighting? also watch out because a lot of lfs' simply use this junk because they can sell a cup for twice the price of an entire bag of playsand to rookies who need to seed. i made that mistake on my first tank, dumped nasty crap sand in there. didn't have the bacteria or worms to seed and created a yellow spot in my sandbed. never again.