Dropped my wife's 2016 Monsoon Grey A3 Quattro on Eibach Pro-kit with Bilstein B8's. This was AFTER I made the mistake of spring only EMDs with her stock dampers. I also have a 2015 S3 with stock suspension still (mag ride) and the B8 + ProKit rides same...which is good! Dont cut corners. GET the B8s all around. You wont regret it. Learn from my lesson.

You can get the shocks and struts for around $6-700, and the springs for $2-300. So at most, $1k to do it right. You can install yourself too with spring compressors and a few other tools.
Finally, get an alignment after.