I personally love your 305 and I think that it is different enough to keep. I like the 47 mm size, especially in the titanium. Sure its easy to say Ditch the 305 based on first glance. I have worn one for months and the size is deceiving to the eyes, because it feels very light on the arm and it's a joy to wear. I recently was going to let my 305 go and put it up for sale to buy the 364, but I tried one on the other day while wearing my 305 and I changed my mind. There is room for both.
