A few ideas for your 'wet' spots;
Carex elata 'Aurea' (Bowles Golden sedge) A gorgeous yellow-leaved grass that appreciates moist soil & will even grow in shallow water.

Carex pendula - has interesting long arching flower stems

Acorus gramineus or Acorus calamus - not grasses but, grass-like in form Both are good on moist or boggy soils.
Several variegated cultivars available

Chasmanthium latifolium - wouldn't like constantly wet feet but, appreciates moist soil.

Imperata cylindrica 'Red Baron' - likes moist soil but not heavy wet soil.

Luzula nivea - snowy woodrush

Molinia caerulea ssp. arundinacea
Many cultivars - a favorite grass of mine and very underused in the trade. Look for 'Windspeil' or 'Transparent' All are well behaved clumping grasses that appreciate moist soil. Not great for winter interest - after the first heavy snow they often collapse.

Spartina pectinata 'Aureomarginata' - Actually prefers low-lying moist area. If happy, this can be an aggressive speader however, it does have gorgeous arching foliage unlike any of the other ornamental grasses - very elegant looking.

Well, that list should give you a good start. I suggest that you take some time & look them all up to see what you might like. There is a good selection of size & form for you to choose from.

Of course, in areas where it isn't too wet any of the Miscanthus would be perfectly happy. They wouldn't like to have their feet wet for extended periods of time.

A.