I'm using 144 Megabites in Woodys Double Digger Pattern. It can be easily bumped up to 156 by running sets of double backers in the 3 empty lugs.
Others have used 102 and other 170 something or other.
I guess its what you like.
I used Woodys template, but I talked to a Woodys tech who used Cats template on his F7 standard, and is trying out their pattern for a comparison with good results so far.
Kevin