Hi and thanks for you Question..
1st question back to you....
Will you have the opportunity to try out the evoque before you order?
If so you will decide for yourself whether it's worth the upgrade
If not without swaying your decision....the 350 watt standard meridian system will still beat anything you will ever hear from a factory spec car
The 850 watt upgrade is ofcourse something else....
I encourage "if you can" to listen to both if you have the opportunity