Hello everyone

I am looking for a Cam system to engrave a girthed area. The software should be able to have the function “ dwindling”.
We work with Inventor 2011 and a DMG DMC 635v eco with a forth axis and high speed spindle.
there are 2 options for me:
1) To find a good software that might even be integrable into Inventor and which is also suitable for 2,5D processing AND engraving with dwindling.
2) Find a cheap software that is not so comfortable for the normal 2,5D processing but good for the 4 axis engraving.

For version 1) I would have a budget of about 4-6T €
For version 2) under 2T €

Thank you in advance for any good hints.