Yes, please try to adopt before purchasing! There are so many wonderful dogs that need homes, Alaqua and the other shelters in the area all have puppies!
Also, you may want to do a little research on the breeds that you're looking into if you've got small children--I know that dalmations in particular can be rather high spirited and play can get a little rough...
Believe it or not, I've always found that my best dogs have been mutts. Mixed breeds, adopted from shelters, always seem to really know how lucky they are to have been picked out to be taken home by a family to love.
Good luck in your search! Hope you find just the right furbaby for your family!