[maupineda]

You can go the custom route, but to be honest, it seems KW is the “best” out of the box. I am finally happy with my setup, but is a mix and match of parts of different makes, all high quality, but required a bit of effort, time and money.

An alternative route is PSS10 and linear springs

All that said, you can achieve a good setup without spending 3k

I would start with

Front Bilstein B6 with OE springs and modified bump stops
Rear Bilstein B6 with 500# TCK Line springs
Maintain the OE rear ride height

This will give you a good starting point, if you want more body control change the front sway. Our cars already have CSL rear sway. If you can afford, get the front M3 CSL sway, otherwise H&R is good.