First off, Why go Springs/FE5's? Its half the cost of going coilovers.
I have Eibach Sportlines on. I went 40k on my FE1's (installed springs at 78,000miles... ) without a problem, and then switched over to FE5's. Not having any issues at all. Ride quality will change, handling will improve.
Shocks and struts can handle the lowering springs, but again, it is based on how you drive. If you beat the hell out of your car daily, plan to replace shocks every 50K or so.
I run my car hard, but drive smart, and Like I said, I wasnt having any problems