So...
A small uppdate on this.
It ended up in me buying the APR CR-6. I like yellow, and it was (suposed to be) cheaper. I ordered it for €31 with a shipping kost of €8, in total €39, direkt payment and 2 weeks delivery. The day after I put my order I had my first visit to the local airport pilot shop. They had the Jeppesen for €34...
Never the less I'm happy with it so far, but I'm alone to learn it, my ground school instructors did not even know about the existence of the CR computers.
For the record, the Jeppesen has one extra features compared to the APR. On the Jeppesen you can do some pressure patern calculations.
I don't miss that on the APR...
@Tinstaafl
I appreciate you recommending the smaller ones, but since I'm not going to use it during flight (helicopter) I thought it was as well to by the big one.
BR
/H