Snook65 -- I really didn't mean to hold myself up as some kind of expert on everyone else's tank, but I'll try to answer.
When starting a new tank, I follow the critter mix of all the species I recommended to grimreefer in my earlier post in this thread.
Start with a mix of snails and hermits not more than about 1 critter per 2 gallons. You can add more later if needed and if the tank will support them long term. That means only 6 or 8 of each type to start, but obviously you want to get proportionally more of the smaller snails like Nassarius and Cerith and fewer of the big ones big ones like Trochus. For crabs, I like PA scarlet hermits and their black-and-whites, and IPSF micros.
If you have a DSB, getting the bristle worms, spaghetti worms, 'pods, and mini-stars is just as important as the traditional snails and hermits. (The numbers of these don't count toward the per-gallon total of snails and hermits.)
If saving money is important, hectini's advice is very good -- buy one of the more diverse "package deals," but get one sized for a much smaller tank, like a 50 or 60 gallon.
By the way, if you are new to reefing, reading and learning enough about each species to make your own informed decisions is a much better idea than following my advice!