There is some great advice here, listen to it. Stance, Megan, BC, etc. etc. are generally crap unless you are just looking to go low on the street.

I have the Stance/Swift combo and it is OK but I would never compare them to a set of real track/race setups. That would be dumb. But of course it would be equally dumb to run a $10,000.00 set up on the street daily.

But most people wouldn't know the difference between a really good setup and a bad one anyway.

 

Some guys running STX have used bilstein sport B8 dampers with threaded sleeves and 10k front /7k rear springs and report that the damping is sufficient. And bilsteins have reputation for good service life and can be rebuilt / revalved.

 

Bilstein is the ****.

 

Bilstein have some non-adjustable coilovers - B14 PSS. I think those are probably the best starting point for a budget option. Swap out the springs and get them revalved, but you will need to get some advice (or do the math yourself) on choosing the correct spring rates and lengths.

Other options are ohlins and FCM (as mentioned). For the price, FCM will design a completely custom solution for you based on car weight, which can really save a lot of time (and cost) of experimenting yourself.