Sorry Michael, I wasn't trying to flame you. I really do intend one day owning an M6 TTL with Tri Elmar.
If only I could grow a few extra kidneys!
Regarding the topic, I think it all boils down to what you're used to and what you're happiest with. I use the Praktica because I have a comprehensive set of lenses for it, a good set of filters for those lenses, and (to my eye at least) achieve some good results with it. Also spares and accessories are readily available at knock down prices on ebay and in camera shops.
If you have a Minolta, are happy with the results and like using it, then stick with it. As Michael said, you can take great photos with any camera.