Single ounces are way too pricey and are marketed towards hoarders and lovers of shiny things. 10 Ounce bars are what you need - still easy to split up into smaller bits should you need to and at the same time way cheaper than ounces. It all comes down to how much you buy at one time - just save up for one bar instead of wasting money buying a couple ounces here and there.
Is silver a good buy right now? Answer these first: Where's your comfort level? When are you selling?
Don't get sucked into buying shiny bullion coins with pretty pictures and reliefs. If it's metal you want, then pay for the metal. The price is lower than it was when I started getting involved in PMs but I don't see the crazy world turmoil that was apparent in 2010-2011. Crappy Canadian dollar doesn't help. If I lived in the US I'd stack monthly but I don't do that anymore.