Labs are easy to find, and come in two types:  quiet labs, more likely English types, and busy labs, who do take more time/ daily exercise. 
Whippets have some terrier in their background, and are more social and more 'obedience motivated' than any of the other sighthounds.  Love them! 
Dalmations were nearly destroyed by that awful Disney movie!  They were meant to be guard dogs, and are.  People will send their toddlers up to a growling individual to give hugs.  Ask me how I know this!  The only dog we've had who bit anyone, giving ample warning, and people don't 'read dog language' well at all.
Avoid guard dog type breeds unless you are ready to manage one.  Love mine, but don't do it if you can't/ won't do right by it.
Mary