I used Kwik crete construction sand medium grain. Easy to clean, clean the heck out of it in smallish batches in a bucket with a garden hose, then clean it again, save headache in the long run. $7 Falls to the bottom quickly doesn't float very much.
Also I like Petco's black sand pretty well - soft but doesn't get stuck in the filter.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves