Hey guys my little brother is looking to purchase an extra battery for his setup. Here is what he has: 1-SAZ1000 2-SA12's at 1ohm Big 3 Decent 35-40ah starting battery, it has a green top so an interstate I beleive. his car is a 96 ford escort soon he will be adding a 2 channel amp to drive a pair of speakers or maybe a 4 channel we will wiat and see. The amp will be driving normal coaxial speakers! the amp might be a 125.2 or 50.4~ I was looking into a battery for him on the SSA store and these two caught my eye's http://www.soundsolutionsaudio.com/store/products/XS-Power-D975-12V-AGM-Battery%2C-Max-Amps-2100A-%252d-2000W-.html and http://www.soundsolutionsaudio.com/store/products/XS-Power-XP950-12v-AGM-Battery%2C-Max-Amps-950A.html to me the basicaly look like the same battery with similar rating just a different price and the XP (cheaper one) appears to be more geared towards an extra battery and not an starting battery. Is what I am thinking correct? Will this battery suit his needs? is there another battery I should look into. And no he doesn't plan to upgrade for about 3 years or so.