I'm just about your size (5'5'' and 125) and I have a G19. The 17 is plenty light, but difficult to conceal. If open carry is your main mode of defense I'd say go for it. If not, I'd say go for the G26. Maybe I'm just being too metro, but I can never make the polo shirt/G19 combo work without an unsightly buldge. However, with a baggy t-shirt and/or a hoody, I can make it disappear. Although, I'm usually carrying my PPK, all around more comfortable with almost as much firepower.