What does a set of springs cost now days, £120? Or for £200 get coil overs which you can sell for £100 oodd in a year or so.
My experience withs springs and loads of others is this, you buy them and they are great for 2 weeks, then you want to go lower or you want it stiffer as you'll still get loads of body roll, or your dampers shot their guts out lol
I've had sub £200 coil overs on 3 cars with no problems, provided you cut the bump stops in half they are fine. My golf is on £160 eBay specials lowered around 100 mm and is comfortable enough
Or you get better ones second hand, my first clio I had AP coil overs second hand got them for £150, they were completely adjustable so we're great