Voxalot changes policy, do I have to change too?

[130166]

At the moment I have a Targa DIP 450 phone(can registrate to 1 VSP or Voxalot only) and Voxalot and that works most of the time, however I still don't know how to forward a call by smsdiscount(somebody know ?).
But because the costs of Voxalot changes, I have maybe to change too. Can somebody advice me?
What is best choice?
1. pay $ 25(= €18,40)/year to Voxalot ?
2. buy second phone(for incoming calls) for arround € 60 ?
3. buy an ATA(which?) for arround € 60-...?

I need at least one registration so people can reach me. And I prefer at least 3 providers for outbound. And I want to call without computer. And sometimes I need call forward, if not at home.