I got my base rock from
Reef Rock from ThatFishPlace.com and I would place it under the LR for aesthetics.
Snails can be found at dozens of places
http://www.reefscavengers.com/; www.saltwaterfish.com; eBay; marinedepotlive.com. liveaquaria.com;
BlueZooAquatics are just a few. I know I'm missing some other very good sites.
As for which ones to get? Use this as guide. You want to get about 1/gal total.
Nassarius Snails : Great detrivores and sand-stirrers. They will hide in the sand until feeding time.
Astrea Snails : A great algae eater, but sometimes fall off the glass onto their backs and will require a little help to right themselves.
Cerith Snails Will also breed in your tank. Good algae eaters and sand-stirrers.
Fighting Conchs : Little vacuum cleaners. One per 2 sq. ft. of sand. They'll eat diatoms and, sometimes, cyano (but not for me).
Turbo Snails : They are big and clumsy. They'll knock over or move anything that isn't glued/nailed down.
amkelly...Everyone is entitled to their opinion. Your opinion is that LR is over emphasized. IMO and the opinion of many/most people here, the recommendation of 1½ - 2 pounds of LR per gallon still stands. It works. Does it need to be in the display tank? Absolutely not. I have seen setups with large sumps that have most of the LR. I don't have the room for that, and have almost 200 pounds of LR in my display tank. My fish have plenty of swimming space in front of, behind and through the rock.