Since I come from a family who farms pure-bred black angus, I think there is nothing that beats the taste of grain fed beef. In fact, I have about 300 lbs of it in my freezer
The hamburger is so lean that you have to grill/cook them on very low heat.
My recommendation is to find a local farmer for your beef. Much cheaper than buying it a steak at a time. You can usually buy an entire side of beef with prices for everything at slightly less than the cost of ground beef than you would pay at the grocery store.
The local butcher shops often have a wall of business cards with different farmers advertising their beef.