I got the buffalos at spot in a starter pack deal, and the eagle at spot for Black Friday. The only coin I bought that had a premium was the 25 peso at ~$3 to hit the $200 free shipping threshold. I'm thinking I might just go around and buy the one-per-customer spot deals from all the reputable sellers until I've exhausted them all, there's at least 100 oz of premium-free silver right there.
Lots of people do that. A guy on Reddit even posted a photo of everything he got,
read it here.
Look at what's at spot. Rounds are easy, usually they give you a handy container to put them in. Most of the time they're buffalo rounds and the same size, so they can fit in a tube together and are interchangeable even though there are a dozen different mints. (Though there are some ugly ones...)
Some of them do bars at spot instead, which sounds great except there's no standard for bar size, so you end up playing Jenga if you want to stack them. That's not to say you should pass on them, but maybe save them for last.
Always buy premium stuff at spot if there's a deal, like the sovereign coins at Bullion Exchanges that are always running when they're in stock (currently an American Eagle, Canadian Maple Leaf, and Aussie Kangaroo), and when Monument/SD/etc run a special. Sovereigns, especially Eagles, keep their value more at resale because they're government minted/backed.
EDIT:
One of the more informative YouTube channels on precious metals is
Vermillion Enterprises, a store outside Tampa, FL. He posts videos daily showing what he pays and sells PMs for, to give you an idea of the spread and how much of a premium, if any, you'll recapture, and for what, and the state of the industry. For instance, today he was paying spot-$1 for generic silver and 90% junk - and generic is pretty much everything that isn't sovereign. He was paying $2 over spot if you had an intact tube of same year Eagles, which gives you an idea about what people want to buy right now. 7:20 is when he talks about the state of the PM market in his neck of the woods.