Prospects and MLB/NBA Star Player Box Break Values?

[homerun28aa]

I decided to give prospecting a shot and wanted to start off by buying about 4-5 boxes in the $100-$200 range and about the same in quantity in the $300-$500 range. Can anyone who collects largely prospects please share their opinion on which boxes in the those various ranges are a) your best bet value wise and b) which have the highest hit potential, that you'd still be able to make at least 40-50% of your money back worst case scenario?

I had the same questions for boxes with autos/game used/rare inserts of current star players, for both basketball and baseball.

Thanks in advance for the advice on this.