Will i be okay with my stock alt?

I have a '06 impreza 2.5i. This model has a 90A alt. Right now i have a kicker dx600.5 but soon want to add a hifonics 1200D for a single sub. This will push around 700W at 2ohms. I plan on doing the big three before i put the new amp in. Will i be okay with the stock alternator with this build?

 
Maybe get a decent AGM upfront. I ran 1200 watts to my subs and 340ish watts to my front stage on a stock 100A alt for a while without much issue. Without my Big 3 though I had drastic drops.
Okay, how big do you suggest for a battery? And in theory since I'll have the fifth channel disconnected on the 600.5 it should only be pulling around 300.

 
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