I personally like the configuration of the MK-760/Swedish K/Port Said/Madsen
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The Madsen is not related to these guns, but is an excellent subgun just the same.
I have a "U" series S&W 76 and have really enjoyed it. I would say that the Uzi ranks way above the M76/MK760 and the rest of the subguns mentioned due to greater parts and magazine availability, but I think that the M76/MK760 are better guns than the Macs and Stens (though there are beaucoup Sten parts kits).
I have heard that the MK760 is pickier about magazines and ammunition than the original M76. The only reliability issue that I've had with my M76 has been with CCI Blazer ammunition.
I've shot Macs and the rate of fire is VERY high (over 1,000 rounds/minute) making it a somewhat difficult gun to shoot well. The M76 is somewhat high as well (725 rounds/minute), but still controllable. The Sten can be somewhat finicky in functioning, but is fairly easy to shoot.
I've heard mixed reviews on the Stemple (.45 ACP derivative of the M76) and they're fairly cheap (about $1600 NIB and they use grease gun magazines). The Reising might be worth considering, too. However, magazines can be a real chore.
Madsens are worth a look as well. Priced near a M76, they're very reliable, C&R eligible, and there are parts kits out there as well.
Lots of fun.