In reply to Hooo:
Hello. Good luck with all of this. My day job is that of a Vet for cats and dogs although I don't own a dog; my house if full enough with a 2 yr old daughter, wife and cat. Rather than give any specific opinion on whether or not you should get a dog (sounds like you will anyway and I'm sure it will be great because I think dogs are brill).....I'll offer a few suggestions to help avoid frustration in future regarding expensive health problems etc.
Get insurance, make sure it covers the animal for life rather than for 12 months per 'complaint'. Dog's get most of 'our' diseases like diabetes etc, which remain very expensive after 12months. The yellow/blue pet insurer is very reliable, and you pay for the privilege.
Giant dog breeds - mastiffs, st bernards, even rottweilers - tend to have very short lifespans and when they get ill they do it mega-style so possibly ones to avoid for the first-time owner.
short-faced breeds - pugs, bulldogs (english more so than french) etc often have breathing issues, especially in summer....and are nightmares when it comes to giving birth (unlikely to be an issue i'm sure), but these breeds are often quite expensive to maintain.
long-nosed breeds (german shepherds, collies, huskies etc) are very intelligent but go bonkers (in an unmanageable way) if they are not stimulated with frequent long walks and given tasks to do - 'if you don't employ a collie, it'll go self-employed'. These breeds make great pets given the right circumstances but from your point of view i think they might be too much hands-on.
Cavalier King Charles spaniels get loads of problems; heart, neurological etc. And they're super cute and soft, meaning the kids love them dearly which is a terrible combo when the genetic dirt hits the fan.
Sighthounds - greyhounds/lurchers/whippets - are generally very easy-going in the home and are happy to relax when a walk is off the cards. that said, they do love a walk/run. however, they can be a nightmare when it comes to eating other cats/small dogs, especially ex-racers, so a lead and muzzle is mandatory. their skin tears easily meaning frequent trips to the vet for stitch-ups.
Labradors are good eggs. I love labradors. Some of them can be nutters when young, but if you go for the chunky/short-legged/wide-headed type rather than the long-legged, slimmer type i find this helps keep them dopey. The advice above - a labrador cross - i think is good advice. Labradors can have elbow/hip/knee problems so insurance is basically essential to avoid 4-figure sums.
Spaniels are probably more risky than their common crossbreeds - springers can be ace but can be HAAARD work. Cockers are often ace but the solid colours, especially red, can sometimes be ASBOs.
The smaller poodle crosses that have become popular - e.g. cocker-poos - tend to be good choices for a young family. Good nature, very active, normally don't shed hair (poodle trait), generally healthy as they are a crossbreed. Try to avoid ones with hairy ear-canals (easier said than done i know) as these can need regular plucking!!
Staffordshire bull terriers make good family dogs and are loads of fun, but may ruin your house when left alone and will draw looks of disdain from poorly-advised passers-by. They can on occasion be trouble with other dogs.
Apologies to the other breeds that I've left-out - smaller terriers, hungarian vislas. If i was in your position I'd either look for a cocker-poo, a labrador cross, or more likely I'd take the family to a rescue centre and talk to the staff there. Some of the true mixtures/mongrels make fantastic pets. If you take some time to get the full lowdown from the rescue centre staff, explain your family situation and most importantly spend a long time with the dog then I think this is most likely to give you the best result. As long as the dog is <8years old you can get it insured no bother.