I have Tokiko TEMS struts, B&G progressively wound springs and ST bars.
At first, the B&G's dropped the car right where I wanted it to be, possibly slightly lower than I wanted, but it was OK most of the time. The ride became somewhat bouncy however, but it handled very well.
As they have settled in, and some spring sag is inevitable, they are now too low for my taste, but the ride is still fine. Handles fine too.
I've been impressed with the TEIN Flex coilovers, and the fact that they make an affordable option to what I have. (I really like the EDFC and making changes that fit where I'm driving at the moment, be it a smooth freeway with few bumps, or a winding side road where I want maximum dampening.)
Most of all however, I want a setup that I can set exactly what ride height I want. (Some rake, and slightly higher than most people with lowering springs...) The roads are bumpy here, and some extra ground clearance and suspension travel is needed to keep the tires firmly planted on the road at all times.
Spring rates and coil over design are important, and I think the Flex is about right since I do 99% of my driving on the roads, and that 1% on the track is going to be fine on slightly stiffer springs v/s the drift/roadcourse setups from Kei Office and others.
Just my .02psi of CO wisdom.