Amp Upgrade Time

I asked this yesterday on the Tige Forum but I am going to ask over here to get some more opinions.

So this past weekend was the annual WWS Tige reunion. My wife and I were lucky enough to win the grand prize which is a $2500 Pimp My Tige store credit. Since we custom ordered our Tige last year it has pretty much everything we ever wanted. We have the clamping board racks, the poseidon mat, heater etc.... So I am thinking maybe we upgrade our amps to the Sinister series amps from WS.

Current system consists of

4 Rev 10s each pair on a syn 4.
8 XS 650s on a syn 4
XS 12 on a syn 2
RE Audio MX 12 on a PPI Sa 2000.1
I also have 2 huge stereo batteries that are brand new for this season.

So I am contemplating going to a SD 2 to run my towers and then I guess and SD4 for the interiors? Houston was it you that did 2 SD6s and have one running each side of your boat? I guess I just want to get the best sounding set up possible. What I have now sound freaking incredible. I know I will gain some efficiency and my batteries should last longer by upgrading to the SD series. Also going from 5 amps to 4 amps should help. I am also contemplating getting an SD2 for the MX12 but I am not sure if the wife will divorce me if I tell her we are going to have to come out of pocket some for the 3 SD series amps. So any help would be appreciated.

Also after reading some responses over there 2 SD6s sounds like a good option. One running the right side of the boat and one running the left side of the boat. I am also thinking of maybe swapping out 1-2 pairs of XS 650s for the 808s.