I wouldn't worry about language. Get the dog from the country you are in rather than ask a young puppy to change countries.
A poo cross is not a hypoallergenic dog. It is a cross between two breeds, one of which releases less dander into the air.
Dander is the most common cause of allergies but may or may not be what your DH is allergic to and it is worth getting proper confirmation before guessing. You might find it is a particular fur type that's easily avoided.
Your puppy may or may not get the genes for less dander and this may or may not be enough not to trigger your DH's allergies (though allergies can be triggered by the tiniest presence of the allergen).
Getting a cross because you hope it won't trigger an allergy is likely to lead to disappointment, a life of discomfort (for your DH) and/or rehoming for the dog.
The breeds you have mentioned are diverse...
Cav: these can be energetic little dogs but unlikely to have the intense need for exercise that some breeds have. They tend to be friendly and playful. They have eyes that bulge out a little bit so can be vulnerable to eye damage during play. They also have the massive problem of syringomyelia and it is worth REALLY knowing all about this before deciding to get one. And being incredibly picky about who you get one from.
JRTs are high octane dogs (we have 2) and they are not for the faint hearted. They are bold, fearless, loyal and energetic. They are up for adventure all the time. Most tolerate children pretty well and will play for hours with a tennis ball. They bark, dig and can be territorial. They can be destructive when bored. You probably know this already as you had them when young. 
Dachhunds are playful, clever and brave. They love to burrow and dig. They can be difficult to leave alone and toilet train sometimes. They can be stubborn. Their backs are vulnerable points and so are not always the best playmates for children. Again, you probably know this.
Poodles (the poo bit of the crosses you mention) are highly intelligent and active and must have regular mental and physical stimulation, they are sensitive and loyal - often to the point of hating to be left alone. A cross could easily display these traits. Or not. It's just the luck of the (genetic) draw.
Honestly, when picking a breed, I really think you pick your poison as all breeds have 'bad' points and you are much more likely to get a happy match if you are realistic about what they are upfront. I would start with firm answers to the basic questions:
- not how much exercise can you give the dog but how much are you prepared to (and be happy). I COULD give a husky 5 hours a day. I'd be worn out and miserable so it's probably not the best choice for me.
- what behaviours could you not live with. I cannot stand barking so JRTs are not a good choice for me (ours come courtesy of a family member who moved in with me because they are not well; I love the dogs but would never choose this breed myself). Many people cannot stand chewing so gun breeds (e.g. the cocker from a cockerpoo) are not good choices.
- how friendly do you want the dog to be to other dogs, animals and people. 'Friendly to all' might seem like an obvious answer but a dog that loves other dogs is not for everyone because they are very easily distracted on walks - what many people want is a dog that tolerates other dogs but isn't that fussed by them.
- how much fur, dirt and drool can you live with and be happy.