It all depends on what you're looking for. The H&R are a more level drop and the Eibach's give a slight raked stance (the rear sits a tiny bit higher... it's really just for looks on vehicles without a solid rear axle). I believe both are progressive rate springs; I know the Eibach's are. If you want firm with still fairly comfortable road feel, progressive is the way to go; If you want a rigid feel which doesn't change in dampening despite the intensity of the load, then linear rate springs are the way to go.
The KYB GR-2's will work fine with the Eibachs (ran that setup for a couple years and really liked it) and it should be just fine with the H&R; Anything with a greater drop than those though and I'd start looking at real performance dampers. If you're looking for a linear rate spring, ST are a very popular choice. They used to have a lot of issues with sagging, but I've hear that they've improved on that.
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