As mbg75 says, dont take the non shedding, hypoallergenic for granted, no matter what the breeder says. If the dog gets the traits of the retreiver or lab, he will shed. My sister has the golden doodle sheds much more than my Newfs. Like he says theres the generation thing, 1-2-3 which is if they are bred doodle to doodle and how many generations.
The golden doodles tend to be more hyper than the labor doodle. You may just wanna look at poodles and dont give it the sissy hair cut. There great dogs. Good luck on what ever you get.
Jack Russels are maniacs!!! Tons of energy, need alot of attention, and dig, dig, and dig! Make sure you choose a dog that fits your lifestyle. For example, if you do not have a yard, then choose a breed that doesn't need alot of exercise.