Neuspeed springs are made by H&R. I've had both Eibach & H&R/Neuspeed in previous cars and I prefer H&R's... In my opinion, they offer a smoother, less harsh ride than Eibach, and usually provide for a more aggressive drop as well. The TSX is the only car that I know of where the Eibach pro-kit drops more that H&R sports. Because of this, I am unsure as to which springs to go with myself... I prefer the lower stance that the Eibach pro-kit provides, but I prefer the ride quality of the H&R's. Since the H&R/Neuspeed is less of a drop, they will work better with the factory struts/shocks. I guess it all comes down to what is more important to you -
Looks, go with Eibach
Ride quality, go with H&R or Neuspeed