Hell, just call the dealership, they'll tell you. Or check the part numbers online. How much are the springs? All those companies you mentioned are good stuff, so yeah. I'd go for about 1.5" Easy install, to boot.
Eibach pro-kit $185.00 1" drop
Eibach sportline $209. 1.4" drop? (doesn't say)
Tein H-tech $189.00 1" drop
Tein S-tech $189.00 ($169.00 SI) 1.5" drop
H&R (some german company I've never heard of) $219.00 drop not listed
I thought I saw HKS, but was mistaken
My only concern would be if SI springs are shorter than the EX, but the ride heights are listed as the same on the specs for both cars.