For 1/2A you really only need 10lb test Spectra line. I use the FINS 40G brand. They are thin and very strong look up "Adventure in Spectra" on this forum and you will find all the information you need to make up a set of lines (very good video on doing the ends). I use a rough formula to select the Lb test rating of - model weight in oz/16oz per lb. times (2 times 10). So a simple example: 16oz model, 16/16 times (2x10) = 20lb test line, pick the closest rating.
Best, DennisT