Sup2T IOS Upgrade to Support WS-X6904-40G

Hi All,
We are currently running "s2t54-adventerprisek9_npe-mz.SPA.150-1.SY.bin" image on our Sup2T (single Supervisor in each chassis). We want to upgrade two of our core 6K to support WS-X6904-40G line card.
I am going through below release note thinking about upgrading it  to "s2t54-adventerprisek9-mz.SPA.151-2.SY.bin"
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/15.1SY/release_notes.html#wp4833604         
There are few code options available to me (see below), What version do you guys suggest me based on your experience with this line card.
In that I found this EFSU compatibility matrix which I could not understand properly. Should I go by this compatibility matrix  & make a decision?
Upgrade to Release15.0(1)SY1 or later before installing WS-X6904-40G (see the "EFSU Compatibility" section).
TIA
Rasika

Every major IOS release, the amount of stacked 6800IA increases.  How many currently, I've lost touch.  
The problem nowadays is some SEs don't seem to know how to sell them or they're not listening to their clients.  It's like they are selling them to get "points".  
You have to be one good network engineer to say "no" due to specific technical reasons.  

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