[240 2NR]

Since eibach springs are listed as something you already have, I would put your new shocks/struts at the top of your list.  I drove around on lowered springs, rear koni's and stock front struts (due to a shipping error) for two weeks, and my car rode like ass.  It was FAR worse than stock.  Having the new koni's up front is like night and day.  Trust me, the stock shocks cannot handle the increased load/shortened stoke that lowering springs create.  For your goals, new dampers and sway bars (bushings if needed) would be my first order.