"Eibach is pretty stiff"
Eibach has A LOT of different springs for A LOT of different applications. For many vehicles they offer two replacement lines, the Sportline and the Pro-Kit, which have different spring rates. There are differences again between vehicle models. In addition to prepackaged kits, you can order custom Eibach springs for your coilovers in 2 inner diameters, 6 lengths, and any spring rate.
People basing opinions of an entire spring manufacturer based on one experience on old stock struts: stop, it's pointless. What will determine your ride quality is the spring rate, and the damping. They need to be well matched, otherwise any spring rate can feel like ****. Spring rate determines how much force is needed to move the suspension in that direction, and how far it can go. It is the dampers that will determine how fast that happens, and how fast the spring will be allowed to push back.