I'm not too familiar w/ H&R springs but a good rule of thumb is more than 1.5" of a drop and you're looking at some serious negative camber and a much faster rate of shock wear. Eibach has their Pro-Kit springs which lower the new Si 1" all around. This way tire wear is kept at a minimum and shock life can be increased significantly so you're not always buying new tires/shocks :) . However, if a big drop is what you want (more than 1.5") then you will definately need a camber kit and some stronger shocks (Tokico/Koni). Hope that helps:)
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