For me, sherpa, the 19 degree hybrid replaced my 4 iron.
And as the degree of loft only goes higher from 19, the 21 degree would replace the 5 iron and so on.
I'd say, if you got the 5-pw, you may only need one of the hybrids to fill the gap to your 7 wood.
But if buying a better game doesn't have a budget.... ( :