Capping the Dirt!!

So im looking for something a little bigger grain size than sand, what brands do you bro-hams use?? I can't seem to decide; I have some black sand on hand but preferably don't want to use it; not that im worried about anaerobic pockets, ive hand sand in a hi-tech tank before with no problems, im just concerned about waste not making its way down to feed the dirt.. little help bromigos