1) How active are biewers? While I'm not an athlete, I do enjoy going out and about once a week for a hike or bike ride. I also enjoy going on daily 30-60 minute walks. Would a biewer be able to keep up with me or are they more couch potatoes?
My little guy is very active. He is constantly going and we go for a walk in the evening every day, sometimes in the morning if I dont have to be at work early. However, when its time for bed, he goes to sleep.
2) How trainable are they? Do they enjoy activities like competitive obedience, agility or rally-o?
He is a year old, we are working on the roll-over trick. He is a high jumper and if I had more time, I would like to get him into some agility competitions.
3) Are they good with other dogs and animals when introduced and socialized as a pup, or do they always instinctively want to kill small animals? I know they are terriers, so I'm a biiit nervous. I own a chocolate lab and a parrot, who enjoys his out of cage time. My parrot is always supervised just in case when around my lab even though my lab has never shown any interest in him. I also have tons of friends who own dogs (one who is a yorkie!!) so the biewer would most likely join in on doggy play dates (once the pup is done shots obviously).
I have a lab, who I rescued and she is a bit shy around other dogs and people. Never agressive, just a little submissive. Joey is just fine with her, and they get along wonderfully. They are little peas in a pod!
4) I know breeders don't like this question because it shouldn't be all about money... and I am not, I know the cost that goes into breeding and I whole-heartedly admire responsible breeding... but honestly, how much does a pet quality biewer cost? I'm talking one from a reputable breeder who does health testing, shows the dogs in a venue such as confirmation, and has a good 2+ year health guarantee, not just a CKC reg'd pup from a kijiji or newspaper advertisement. I live in BC, Canada... is it realistic to hope for a $1000-$2000 price range, preferably $1000-1500?
I have no idea what the price range for a dog in your area would cost, but I think you are in the correct ballpark 
5) How hard is this breed to housebreak and crate train so there is no separation anxiety? There is never anyone in the home gone longer then 4 hours, there are 4 family members and I have reliable friends and family I can drop the dog off with if need be, but if there's only one person in the house and they need to be off somewhere for a couple of hours all the sudden it would be nice to have a crate-trained dog.
When I first got Joey I didnt have a crate, so he isnt "crate trained" he has an XPEN that he goes into while we are gone, and its right next to my labs crate. Mostly, when we go out and about, he will go with us.