I bought a D1-3 TOS 125mm 3j SC chuck from Rotargrip many years ago and it is still going well, not super precision but as good as you get with a SC 3 jaw.

Emgee

Another +1 for TOS, it is the best chuck I have.

Thor

I have bought 8 inch Bison chucks in the past from Rotagrip ,and they have proved very good ,one is 30 years old and had a lot of commercial use, so I bought another for regular precise jobs and kept the old one for rough jobs,plus i have a 6 inch TOS from another source and that has proved ok, I buy my back plates and soft jaws from Rotagrip,though looking at current new prices,the eastern european chucks are a lot more expensive than they were,though I have found Rotagrip to be a good supplier, I have been told that Pratt Burnerd chucks also come from eastern europe though they still use their own dimensions for the jaw sizes etc. Never did see the point of the expensive grip true chuck, the ordinary Burnerd chuck was very good if looked after ,its overtightening and straining that ruins a 3 jaw chuck, I also have a 5 inch Burnerd chuck for my Myford ,i aquired it second hand,it required a backplate,so I machined the register with a couple of thou slop, put an inch dia precision roller in the chuck and trued it up on the back plate with bolts a little more than finger tight then really tightened it when was running true, you might ask why have a 5 inch chuck on a Myford when you also have a Colchester,well some times with tricky jobs which easily fit in the jaws of a 5 inch chuck do not fit so conveniently in 4 or 6 inch chuck jaws,and the 5 inch is for only occasional use,I dont go silly and spin it up to top speed.