Seaguar Invz-x, Abraz-x, and even the cheaper Red Label have all proven to be great line for me up to 12lb at that point i switch to Berkley 100% because I seem to detect more bites with it, that is up to 15lb - I never use any heavier than 15lb never found a need too, I can barely break off a good snag with 15lb so see no need to up size any more. I have tried everything and anything except the $40 for a 200 yrd spool stuff and I have had ver little trouble out of the Seaguar. My recommendations are:

8-10# on shakey heads
12# on T-Rig
15# on C-rigs and Jigs

Again just my recommendation - for me this group has been tried and true for 4 years now IMHO