BC has real good rep. I had them on my G35 and loved them. Very stiff and with an amazing drop rate. In the Lancer world, BC are one of the top ones. I was interested in waiting on these too, however i have heard more good things about NGM.
I guess it matters what people want out of their coilovers.
I want SMOOTH plus LOW. And I think HSD full fills both needs. like you, I think BC are stiff and I have Megan Racing coilovers on my 93 accord and although they are great they are WAY too stiff. I have zero body roll but I miss my smooth ride.
Plus, Like pierce mentioned in another post, the way the rear strut is built has a lot to do with how low you can go safely.
look at NGM rear strut vs Megan Racing. See how one hangs below the mounting point and the other is mounted on top. Well the NGM (top) hangs and if you lower too much the thread body starts to stick below the shock body and has a greater chance of getting damaged rather then the strut body build on the bottom pic.
I don't know if that makes since. But I do plane to slam mine and how the rear strut body is built will greatly depend on which i chose. Seems like it is hard to find the actual picture of coilovers for this car per manufacture.