You Wrote
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PERM LC certified in January, filled for I140 in April 2006.
Now, August 2004 LC RIR got approved, please help me what should i do?
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Its your choice but honestly with a PD of August 2004 you have better chances to reach I 485 stage in a shorter time period. January 2006 will be very long depending upon whether filed in EB2 or EB3.
Do note, I had a PD of Dec 2003 with RIR LC approved in Dec 2005, but still went on with a new PD of PERM application in May, 2006. I have both approved now but still chose to be with latter PERM approved date.
Check out this forum more, you would have better understanding there are many threads here of the similar predicament [including mine]
I hope I have been of some help.