On my 94 E320T:
Front Limo bar, 036 rear bar and a set of Bilstein sports. It's perfect, handles better than my 036 for now... but my E60 suspension just arrived so that will soon be rectified.
The Limo and 036 bar along with the Bilsteins should be under $800 if you go through partsdotcom for the bars AND dont forget to order new bushings.
But..... like Z said, get the correct wheels with the correct offset corrected FIRST before throwing any money at something in the hope of better handleing.
In fact... before you worry about handleing, make sure your subframe bushings are good, you can use R129 parts, they be Sportline now. Same with the front LCA, use early Sportline bushings or LCA's for the firmest ride.