There are SO many opinions on this topic. I personally believe that if they are still with the mother, then wait as long as you can! Mom will teach them about proper behavior and potty etiquette (meaning, don't go potty where you live and that means the crate too) so they are often much easier to house train when they are a bit older and are sometimes more able socialize with other dogs. If the option is there, I actually prefer 10 or 12 weeks before picking up my puppy. I would offer to take a shirt that you've worn or a blanket you have slept with for the puppy to get used to your scent as well so that you will at least be *somewhat* familiar in some way.
I usually try to stay away from this topic as I watched a huge row on a basset site about it, and it is just a matter of opinion. I would definitely wait until 8 weeks at the youngest. I really just think you should do what is right for you and your family
All that being said, CONGRATULATIONS! I am so excited for you! I can't wait to see your new addition so be sure to post tons of pictures!