Matthew Muskovac , Feb 05, 2011; 09:31 a.m.
I have the Minolta focusing rail, macro copy stand, and bellows from the 80's. Minolta equipment from that era is of excellent quality IMO. I believe all three were purchased separately. The rail can be used by itself. Minolta made several different styles over the years, mine has a dovetail rail, others have a dual or triple rod rail. I believe the rod ones are earlier.
I also have a Nikon PG-2 Focusing Stage ("rail" would have been a better name). This one is nice because it has a swivel to rotate the camera to vertical. This one looks similar to my Minolta and is also excellent qualilty. There is one with a starting price of $150 on ebay, a reasonable price if you can get it for that.
Of all the ones you mentioned, Novoflex would be the lowest quality IMO. RRS stuff is probably the best made stuff in the business. I don't have any Kirk stuff but I think it is pretty good also.