OK go with the yellow top optima as it can be deep cycled hundreds of times (recharged) not like you will need to but cool to know that you can, as for a cap. I would get the C.A.P. 5 farad would be more than enough for that setup I think. Although they go up to 15 I think but 1 farad = 1000 watts 5 farads you know so I think that the 5 farad will suffice. As to where to get them talk to tom.