Lowering springs work well to give you less fender gap and increase the overall ride stiffness. A few notes:
You can run them with your stock dampers HOWEVER if your stockers are getting long in the tooth, I suggest replacing them while you have this done as it's easy. Also replace your hardware and mounts/bearings. Bilstein B4 or B8 or Koni Active or Sports all are good options to use as replacement dampers with sport springs. See my video here for some info:
H&R and Eibach are big names the make quality springs. Check out the new APR ones as well. All the springs are basically ~$250 regardless of brand. The lowering you get will vary often vs. what the companies state as there are many factors that impact ride height including the actual corner weights. Most folks want about an inch and that's what most of these will give you as if you go too much more you will eat into your bump travel too much...which bring me to....
The main issue with lowering springs is that you are eating into your bump travel by lowering this way - you get less bump/more droop proportionally vs. the stock setup (overall travel is the same if you using the stock/stock-replacement dampers - you are just sitting lower within the travel if that makes sense). The bounciness some complain about is mainly do to this - some springs will come with new jounce bumpers that can aid in reducing this issue. I run H&Rs with B8s on my Sportwagen and I think it rides great.