Hi guys

I am going for my OCA exam soon. After the exam, I am thinking of taking an expensive RAC, or performance tuning 5 days course, and just for kicks take the expert certification exam either 10g RAC or 11g tuning; no harm trying to chew something bigger than me and spice up my beginner CV . I know getting DBA job is quite hard even junior ones. Btw, I am a instrumentation engineer wanting to switch field after 13 years in power industry.

I have no clue what most Oracle DBAs work environment is like.
So, considering the general market demand right now, and maybe technical learning abilities, which certification would impress the interviewer more? 10g RAC certified expert or 11g tuning certified expert? Which one let the interviewer think "Gee, I think I will put this guy to work straight away, I think I will hire him".

Advance thanks.