dual 10's or quad 8's

[///M5 2,833]

the sa's with a slight advantage

Um, no. Slight is a term I would use for audible.

[dbsupra 69]

Either one of two things is happening.

1) You live in Pennsyltuckey so everyone you speak to is from West Virginia.

WTF does that mean?

[Impious 1,476]

the sa's with a slight advantage

The difference in SPL is inaudible. 

 

And I'm going to gander a guess that a pair of the DC's would be less expensive than four SA8v2s, which makes them the logical decision since the response is extremely similar with either option.  Not to mention the easier installation with only having to install and wire a pair of drivers instead of a quartet.