What do you think looks best for wedding bouqet - posey or cascade?

It really depends on your dress. If you dress is simple, you probably just want a simple, round bouquet of flowers. It your dress is more of a ballgown and fancier, you'll want to go with a cascading bouquet. I'm thinking since your reception is in a barn, you're probably having a simple wedding, so I'd go with the simple round bouquet. Daisies or sunflowers sound lovely, but it's up to you - most flowers look good in any bouquet arrangement!