Jeremy,
The Hi-Matic 9 is a great camera. I really enjoy using mine. Check out this recent thread:
http://www.rangefinderforum.com/forums/showthread.php?t=63286
Hi Jeremy,
In some sense the thread our friend Camera Bear is pointing to, is misleading: At that thread the initial poster asked if to pick the Minolta Hi Matic or the Canonet, but in fact he was comparing apples and oranges.
This doesn't mean that no one can have a preference for apples or oranges, but let me try to introduce some VERY gross order in the mess.
The Hi Matic 9 belongs to a branch of rather big cameras manufactured by the 60s', and the Canonet QL GIII (there is a version for 40mm lens and another for 45mm lens - both the same size) is of latter and more evolved features.
Our friend
camera bear was right at that thread to point to the strongest advantage of the Hi Matic vs the Canonet: the lens. Nevertheless there are other cameras considered to have similar or even better lens (here we are walking over eggs), like the Konica Auto S2, or the Yashica Lynx series.
Since the Yashica Lynx cameras differ, and are a story by themselves, let's say that I personally would pick the Konica Auto S2, for giving me better info at the viewfinder, although its max ISO is 400.
So far for biggie cameras of the 60s, being sold at the most convenient prices, and offering both auto and fully manual controls of aperture, speed and range finding metering. By average these cameras weight 750 grams, their shutters are quiet, and I find them very comfortable to my hand.
If you are looking for a bit less manual control, same high quality lens, you have the Yashica Electro series, who will ensure the most contrasty yellow patch from all.
Now we arrive to the 70's and the manufacturers step into the ring with their most compact possible models, giving us two size cathegories: compact cameras and ultra-compact.
The Canonet QL GIII (40 or 45mm) are compact cameras, perhaps the most featured of all, but which for my hand are a bit too compact, i,e, a bit uneasy to grip. There is a modern Yasica Electro of the size alike the Canonet, called Yashica GX.
Other models, whose price is between $100 and 350, belong to the ultra compact cathegory, like the Konica Auto S3, the Minolta 7sII, and the smallest of all, the Olympus 35RC. Here the lenses are 40mm or wider. All of these offer the auto+manual combination in the smallest size.
BTW, Olympus rangefinders include, from small to big, besides the RC, the Olympus 35RD and "the queen": the 35SP. These are among the most expensive of all fixed lens rangefinders.
I am sure I have left many holes, besides some mistakes, that other friends may like to correct. You also can "search" the fixed lens subforum or other dedicated ones.
One thing I would like to leave clear. Big size is not necessarily a disadvantage. It is very personal.
Cheers,
Ruben