Honestly? Get another JRT. I'm not just saying that because I own terriers; I've also trained and worked breeds ranging from American Pit Bull Terriers to Labradors to Rottweilers and GSDs and Border Collies and lurchers.
Your list isn't a great one to be honest. Not only from a health and longevity standpoint, but also considering your circumstances. Some of the suggestions in this thread aren't much better either!
With a young child, and a baby on the way, do you HONESTLY have space and time to provide a decent outlet for a high energy, intensely focused and driven working breed? Huskies and Malamutes are long distance dogs with bags and bags of stamina. A Collie designed to run up hill and down dale for 10 hours a day will soon eat your kitchen, couch and anything else it can find in sheer frustration while you're trying to care for your young family.
How much real experience do you have with dominant, potentially aggressive, ambitious (seeking to climb in the 'pack'/family) dogs? GSDs, Rotties, Dobes etc are great dogs in the right hands (ignoring things like crippled dysplastic hips, overbreeding for the show ring etc in most dogs in the UK); however they're certainly not lap dogs and I would strongly advise on giving them a miss if you're inexperienced with big driven dogs.
Be honest with yourself, you'll only regret it down the line when the kids are screaming, your dog is trying to take charge of the pack, doing wall-of-death because it's only getting an hour exercise a day.... you get the picture.
BTW, for those shouting 'Lab'... Labs are nice dogs on the whole, but don't kid yourself. More Labs bite kids than do Pit Bulls (read up on it). No dog is a toy, or an ornament. They have instincts, drives, personalities. Pick one most suited to your situation not simply your desires.
A JRT is fold-away small, but still a 'big dog' at heart. They're rough and tumble, active and agile, laugh in the face of kennel club-esque ill health and deformity (yes most of the dogs in the UK are deformed and suffer accordingly), and they are still low key and amenable enough to fit around a family, and indeed be a full part of it.
I suggest no matter what, you think long and hard. Don't just get a big drivey dog because you fancy one. The guy who's spent years working police dogs and protection dogs (sport and real-life), search and rescue dogs, farm dogs and hunting dogs has been there, done that, got the T-shirt and seen it all before.
Don't let this put you off, simply have a brew and a good, honest think. Enjoy your new additions, both human and canine
