I know this probably isn't what you're looking for, but I'll give my advice anyway.

The suspension in your car is what keeps you from driving off the road and killing yourself or others. I know high quality coils are expensive. But in my opinion, if there's any area of car modification that you should absolutely NOT cut corners on, it's the suspension.

Why not save up a few more bucks and buy an entry-level coilover from a well known and proven manufacturer. In my opinion, you can't beat KW V1s for a lower cost coilover.