Of those you mentioned, the 707 is a great knife, well made, and very size efficient. It could be the only knife you ever need. The PM2 is also great. It is a fairly large knife and if you want a knife to use with gloves on outdoors, this is a good choice. These two knives are almost like custom in quality. The Ritter is pretty nice for the steel choice.
You mentioned the Caly3 and I think it is wonderful. I slightly prefer the ergos on the Delica and Endura, but really do like my Caly3. It is slimmer than it looks. The handle is exactly the same size and nearly the same shape as the much vaunted EDC knife, the Kershaw Leek. I would not hesitate to buy another one.