Golden retrievers: lovely, lovely dogs but: big, need a lot of grooming, shed hair like no tomorrow, can be prone to slobbering. Can have hip dysplasia, so check out the average hip score and don't get a puppy unless both parents are hip scored and below average.
Old English sheepdogs: need loads of exercise and stimulation, very big and strong, need firm handling and training and a nightmare for grooming. Would you be able to lift a dog that big in and out of the bath easily when it gets covered in mud, which will be most days in winter?
Springer spaniels: adorable but need loads of exercise. They tend to be manic until they're about 3. Remember that this is a breed which is designed to spend all day flushing game and retrieving. They can run for hours on end. Not an ideal town dog, imo. Easy to train provided they get enough exercise. If you plan to take up shooting, there's nothing better imo.
West highland terriers: I'm a huge terrier fan and love Westies. But: they can be nippy, are prone to skin problems, are (like all terriers) highly intelligent but very independent and wilful. They also need a fair bit of grooming because they don't shed and should, ideally, be hand stripped (the coat gets soft if clipped and loses its weather resistance).
I'm not convinced that any terrier breed is an ideal first-time dog, because they are so independent and strong willed that training them is a challenge.This is not a criticism, I am addicted to terriers and it is the voice of experience! However, if you like westies you may like to consider the Cairn terrier, which is similar in appearance but seem to have a steadier temperament and be a little more biddable. Border terriers also seem to be less independently-minded than many terrier breeds.
The upside of terriers is that they are clever, funny, endlessly entertaining, small (there's a lot to be said for a dog you can tuck under your arm if it's misbehaving) and utterly lovable.
Re the allergies, it is often the dander rather than the fur itself that is the allergen. I am more allergic to the non-shedding lakelands than I ever was to my labrador cross, who coated the house in thick black fluff twice a year.
Someone should produce a book on the downside of all the breeds. Most breed books are written by lovers of the breed, so play down the negatives.