I went the coilover route for a while. . .
IMO, coilovers are nearly useless on a daily driver that sees minimal autox time. I rarely used the adjustments (just damping for autox, usually), and the benefits that I did see at autox were not really worth having to deal with the ride quality around town. I ditched them right before my son was born, and replaced them with a set of Prodrive springs - and I'm quite glad I did.
They're much firmer and feel more confident than stock, but stay compliant for daily driving. It's a nice solid ride. I can't really comment on the rates themselves, as Prodrive doesn't publish theirs. Apparently the rears are progressive to help ride quality (see pic).
They also drop the car lightly - about an inch or so, with a bit of a rake to even out the front and back. That'll give you what you're looking for in terms of ride height. I reached the same conclusion: too low = scraped bumper = unhappy me. I don't fear speed bumps quite as much any more.
Being as pleased as I am with my Prodrives, I'd recommend a set of springs and a sway bar upgrade. You'll save a ton of $$, and have a much improved ride.