Hi, i purchased a Dodge Ram a few months ago. It came along with a dual 10" fox box under the rear seats. The box is ported. The subs were two 10" Sundown SA. Now the seller gave it to me, it was all in working condition but the amp was blown. System was a freebie.. Dont want to spend to much money on it as its my first system. Whats a good budget amp to run the two subs? Also my battery seems to be going. Barely starts now that the cold temperatures are here. Is their a certain type that will run both the truck and system instead of having two batteries?