for me, definetely, Saint Mary's Road and even more Saint'Anne's Road. They are really urban in many ways, the corner of St. Mary's and St. Vital Road reminds me of my Europe hometown. St. Vital Road is also very nice.
In these 2 streets there are a lot of apartments, people is nice and not trashy\drank\poor, but at the same time they're not as suburban as Fort Richmond or Pembina (which I actually don't like at all as street, way too large).
So, let's move eastside of Red River!