Patchable just means you can load unofficial software, that has been produced for that particular receiver, and open all the channels that your cam can.
This is usually done using a null modem cable connected to your computer/laptop.
Linux receivers, and some newer receivers have extra capabilities, but it all comes down to your budget and what you require.
Premiere will be changing their encryption to Nagra 3, at some point, as they are no longer able to stop any hackers, using their current encryption.
The receivers you have listed seem quite old, although the Humax 5400 is still very popular, depending on the model.
It all depends on the price you can get them for, as older receivers do break down, and so maybe a new, cheap receiver might be more worthwhile.
If local, why not programme your cam and take it round, to check in the receiver, before purchasing.
You might also take a look at a DigitAlb subscription, if interested in the English Premier League games.
I'm not sure what is available in Denmark, but most suppliers will ship to anywhere in Europe.