2 15's help?

[fibl472 0]

I bought 2 fi btl 15's fully loaded, but because of the backup, i don't have in my possession yet. i also have one kinetic hc3800 battery to supply the majority of the power the subs need. i have purchased a 200 amp alternator from Ohio generators, installed with a big three upgrade. i still need to decide on an amp. im not sure if it would be good to over power the subs by a little or not. keep in mind its just daily bumping. but as a fail safe i was planing to get the BC3500d. i plan on not walling 2 subs until i can save up for another 2 15's, but i will be taking out the back seats. the box will be both on the seat and in the trunk for the maximum airflow. if there is a different amp someone can inform me about that would be great.  any other things i should be aware of? thanks.