Matt
Be sure to keep an eye on the Daylily Classifieds here on garden.org (as mentioned previously). You will find a lot of good bargains there. You will be able to purchase many very nice cultivars there. In case you don't know where to find it, just go to the Daylily Form and look for this:
Also, when you find some you are interested in buying, look at them in the Plant Data Base before you purchase. The pictures in the Plant Data Base will show you how the DL looks in gardens across the country. The same cultivar may look very different in your garden soil than it does in another location.
If it happens to be reviewed as a "daylily of the day" you will see comments from people that already own them. You will find out which zones it does well in (or what zones it may struggle in), if it is a fast or slow increaser, if it holds its color well after all day in the sun, and much more.