I like the SA 3500. That's what I plan on going with. Do you guys think I'd have enough electrical for the 3500 with a 270 amp h/o, big 3 in 0 gauge, 0 gauge run to the back with a xs d3400 in the back?

You should be fine.

Go ahead and get a volt meter wired up in back so you can see what the amps are getting.

Op...another thing on the alts. Check what other cars share your engine if any. When I contacted dc they informed me that my xb had the same engine as the camrys so I was actually able to get a better deal.

And glad your going sealed. Love my xcons sealed