Primal Scream is an awesome daylily, but it didn't start to take off until I moved it to a different bed earlier this summer. My only complaint with it is that I just can't get a decent photo of that glowing orange color. It is one of my favorite daylilies.
I also love Wineberry Candy, it too is putting on quite a show this year and has been blooming for a month. Holly Dancer just started blooming now, and is quite happy and a beautiful red.
It seems to take my daylilies 2-3 years before they really explode on me with blooms. This year has been remarkable, the cooler temps and extended rainfalls have allowed my daylilies to grow taller and bloom more it seems.
Another thing to think about is bloom season - by purchasing daylilies that bloom at various times, it is possible to get 2-3 months of blooms
I planted peonies in the middle of my daylily bed not quite 2 years ago - I think when they mature I am going to be very happy with the combination. I also have tulips and daffodils planted right among my daylilies- they seem to do well for me so far.
I did find that mixing Iris with daylilies for the most part did not work out well for me. Daylilies like to be a tad wetter than iris do. I ended up digging everything up and planting them in different beds a couple of years ago and everything is much happier. It was good in theory, but reality wasn't so good. ~Jan