5040's or 5x4" props will give you a little more thrust and a little more speed, but at the cost of shorter battery life (slightly less efficient with higher overall current draw).
With the 5030's (5x3") you'll get plenty of power, and most importantly the Diatone's are DIRT CHEAP. They're not fantastic to fly on and they're almost all out of balance (IMO, that contribute 80-90% of why they don't fly great), but they're CHEAP, and as you learn you will chew through props. Treat them as a consumable item because your "learning" will consume props.