For the heavy stuff, 30lb Big Game, nothing else I've tried really comes close; for lighter stuff I used to like Ultima F1 but have converted to the new Powersteel. It's a bit more expensive but a helluva lot tougher and a lot less stretchy - so far it's outlasted F1 by 2 or 3 times, so works out cheaper in the long run as I'm not having to re-spool so often.
heard good things about that powersteel. will be interesting when i try it. i remember when the grauvell tecklon gold came out and the breaking stains were well out along with the performance.
i personally stick with suffix tritanium for winter long range cod fishing.