Perhaps it's already been mentioned, but wouldn't a Mack coaster be an insanely perfect fit for the park?
A custom layout of their "mega-lite" a la Alpina Blitz or a slightly scaled down custom launcher akin to Blue Fire/Helix (combo lift/mid course launch, anyone?!) would seem to fit the park like a glove. One of these would also align with my guess of capital expenditure for a park Holiday World's size (say $12-18MM).