In just doing some quick calculations (assuming you're staring with 1797cc), a piston 81.25mm will bring you up to 1808cc and a 84mm piston will get you up to 1933cc.

Essentially you'll have a 1.9L with 84mm pistons. You'll also get some added tq from the increased displacement. Any idea what compression you'll be shooting for? Extra compression will also give you some more power across the board.

I'm sure there's other people on the board that can give you more detailed info than this, but at least it's a starting point. Keep in mind that the 81.25 pistons can go in with minimal work, while the 84mm will probably require a resleeve.

EDIT: I forgot you're boosted. My reply is presented from an N/A perspective ... I always forget about you crazy F/I guys.