Jepp is the only game in town for a 430. Garmin offers nav data updates for the WAAS units but not the non-WAAS, based on clicking around their site.
You choose between Eastern and Western region (unless you want it all, which is a only slightly more). Midwest is included in both.
Highy recommend getting a second data card (Ebay is handy for this). Otherwise, you have to remember to bring the data card home from the airplane to do the update.