Re: which would you choose
I like the idea of the 1800 amps and a single 15A. As you said, more expansion possibilities. Oh, and I wouldn't go that far as to say that you won't ever require 1800W+ RMS from them.
As for wiring, I guess you COULD get away with a 4gauge, but to be safe, at least a 2? If you're concerned about wiring costs, get welder's cable instead. Ask snova for details.
Sony C90, 210 EQ
Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
RF 60.2 amp
Soundstream picasso 1400.1D
Bass drive-by's are uncool.