Passed IBM-483 and what next 158/486 ?

[Mano Poreddy]

First, thank you all for all your valuable contributions and especially Java Ranch for having a system like this which really works; actually your help is invaluable.
Trust me, I wasn’t serious about certifications but looking at you guys I attempted for it.
Back to topic, I passed only with 70%. More score would have made me more confident but no regrets. I used Mastering EJB and EJB Component Arch (I liked this book as it blends flavors of J2EE design patterns with EJB working). I liked the EJB Life Cycle & Transactions better in O'Reilly - of course my favorite series.
Quick Question, going ahead which one is better for me at this juncture IBM 158 Vs IBM 486.Till yesterday I was thinking of IBM 486 but just now I realized the topics for IBM 158 are close to IBM-483 , so it may take little effort for me to prepare for 158.
What do you guys suggest? And how long, would be a reasonable estimate for me to prepare?
Any more suggestions, tips….. all welcome and again THANK YOU