Haha just looking up this same topic...
So far I have the following info...
Play sand is great, but requires a lot of rinsing before use.
Silica sand is good and very bright, but I'm worried about filter problems from loose silica killing pumps and it's silica, silica is sharp, not to sure how this will impact fish life, I am stocking with goldfish/koi and 3 Plecos(most intimidate stocking) so I am sure the sand will be ingested.
Quickcrete fine sand was as cheap as playsand and it's supposed to be ready to put in the tank...
I am using black sand from Petsmart,the 20lb bag was $17 and it barely coved the bottom of a 75G (48x18x22), a 50lb bag of playsand will cover about 2" deep for 1/2 the price.
Doing an advanced search for 'home depot sand' and go for threads and not post, as posts are the ENTIRE diatribe, sometimes 20+ pages deep!