3 lands and 2 pieces of ramp was an automatic keeper. In crafting and testing decks I used to be happy if I could (depending of course on the commander and average cmc of the deck etc) consistently get 3 lands, 2 pieces of ramp, and a couple of cards I can play early on in my hand.
I've always built my decks with a good amount of draw, but recently I'm prioritizing it even higher.
