My opinion (having worked with domain registrars for the last 7 years) is that it is always a good idea to have a .com domain. From a branding point of view, the .com reigns supreme. In terms of popularity, there's no question that a .com is the number 1 TLD that's sold. Since you're in the EU, I would still suggest getting the .eu, but only as a complement to the .com. You could always use a 301 redirect and forward it to the .com.
Look at it this way: if you do go for just the .eu, there is the possibility that your customers may still try to access the .com version of your site. If that's a TLD that you don't own, that's traffic you've lost unnecessarily.
Now if the .com is going to cost a few 100 and if it's within your budget, then I would strongly suggest making the investment. If it's more and out of your budget, then I would suggest appending words to your business name to give it a more unique look. For example, instead of xyz.com, go for xyzconsulting.com.
Hope this helps and good luck!