I love my dogs, however I have said that despite owning / having family dogs since I was a child the ones I have now will be my last.
The cost of owning a pet now is not to be taken lightly, insurance is quite expensive if you have to make a claim. Then there are obvious things like, beds, blankets, leads, collars, training, vaccinations, insurance, food, bowls, brushes all add up, and not a one off cost either.
Then there is a daily commitment - enjoying long walks is great - but going out every day no matter how busy you are or what the weather is, isn't always fun. You also have to plan days out, holidays and even going out to work around them being fed and walked. Dog's are good at fitting into a lifestyle, and could forgo a long walk every now and again, but ultimately they need some mental and physical stimulation daily. They can't be left for hours on end obviously, so there can be an added cost for kennels, pet sitters or dog walkers.
Dogs bring great joy, mine make me laugh daily and I go out every day for a long walk, rain or shine, but as I get older I'm ready to not have the expense or the commitment a dog needs.
I would research the breed you want extensively, visit (reputable) breeders, speak to them. See what dog could fit your lifestyle and if you really want to have the responsibility for the next 10/15 years, then go for it. Just make sure you research the breeder too - lot's of poor ones about who would give you no support should you need it.