Soft Coated Wheaten Terrier & Basenji Owners I Need Your Aid!?!?

My bf and I already have a 2-year-old Italian Greyhound and we just LOVE her. She is VERY socialized and has been around MANY other dogs & can even handle playing w/ my mom’s 8 month old boistrous lab puppy so she won’t be a problem.
My bf has fairly bad allergies and can’t even handle cats at all so I’ve been researching dogs that, like my IG, shouldn’t cause him trouble. I’ve been researching and thinking for a good 6 months now and I’ve narrowed it down to 2 dogs, the Basenji & the SCWT.
I want to know from YOU how easy are they to train? How well do they bond with you & your family? How easily do they pick up & react to your moods? How is the grooming & how DO you groom them?
How active are they? How do they play? And any funny sweet stories that would be great? Also anything else you feel I should know?
Thank you I REALLY need thorough answers on this one.
Also I live in Colorado, which would be better suited for our climate?

Sighthound Owners?

Borzoi
Deerhound
Greyhound
I am looking for the right dog for my personality and some sighthounds seem to fit the bill, but I have a few questions:
I have heard that greyhounds are easy to train and though they like to run, they are perfectly content to nap the rest of the time… are the other sighthounds I mentioned like this as well or are they high energy and more stubborn?
What, in your experience has been the longevity and health of any or all of the 3 breeds?
About how much does it cost monthly to feed these dogs? They are all very large, but some of them don’t seem to weigh much compared to their height so is feeding them extremely costly?
Some large dogs are recommended for small spaces like apartments but others must have large yards. What would you suggest for these breeds?
Lastly, are any of these dogs at all protective (I’d be walking them alone and at night so it’s something to think about).
Thank’s for taking the time to answer my questions.

Do Greyhounds Like To Go For Long Runs, Such As Training For Marathons With Their Owners, Or Only Shorter Runs?

I like what greyhounds look like and the idea of saving a dog. I like to run long distances. Do greyhounds like to run long distances with their owners or just shorter distances? How far do they like to run each day? I can’t have one right now but when I get to the right place and time, I would really like to look into having one or two greyhounds.