What are your expectations of the GR-2's? You do know they're only a slight upgrade over stock... Do you honestly think $120 struts are going to perform?
If your are serious about wanting coilovers you should be looking at MonoTube struts like Bilstiens and having them valved to match the rate of the springs. You'll still have another issue that the height of the strut rod will be too tall as you're using lowered springs lol... But you wanna gangster the ride, go ahead, it'll still work... Lol, but don't think that GR-2's and a stiffer rear sway will fix anything. Sorry : )