I'd second what Gervase said. I still use a Pentax SP500 (500th/sec version of the Spotmatic 1000th/sec) most weeks as well as my trusty Minox 35mm and damn good it is still after 30-odd years.

The Pentax is better made and lighter too than the Practika. I've seen plenty of Spotmatics around still in secondhand shops (c. 75-80 pounds) and Practika's too (a little less, maybe 40-45 pounds) and also lenses that fit both too. I just bought a 135mm Pentax telephoto lense in Berlin for the equivalent of 25 pounds. These are good value cameras for the quality of shots they take. I wouldn't personally recommend the Zenit though.

Regards

mcmoo