There is NOTHING wrong with silica sand
How many times do I have to say this? Silica sand will work just as well as aragonite sand in a reef tank.
So, I would get the cheapest/best looking sand. I've seen some that has the green label in one of their standard bags that was "White" sand and it looked pretty good.
Once again, nothing is wrong with silica sand. It doesn't significantly leak out silicates which cause algae.. it takes forever and a half for it to break down. And aragonite sand doesn't help all that much with calcium buffering, because CaCO3 starts to dissolve at a pH less than 7.. if your tank's pH is less than 7, then the type of your sand is the LEAST of your worries. Dr. Ron also did a study that showed grain size is irrelevant.