what you buy totally depends on you. are you cooking for one? don't buy 6 pounds of fresh salmon cuz you'll never get through it. do you have access to good fresh seafood? consider the source. i won't eat any farm-raised fish.
chicken is easy to batch cook for the week or use in soups and stews. you can also use small bits in stirfry. i don't find it as satisfying as red meat so don't eat it all that often.
do some web-surfing for primal recipes and see what looks good before you spend buttloads of dough on food.
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway