I've recently switched to Mogami for both my bass and amp speaker leads. Perhaps a few pounds more than some other brands but far cheaper than anything by Tsunami, Evidence Audio, Vovox etc.
Previously I used Planet Wave American Stage cables. They were good too and come with a life time guarantee.
I've used designacable for speaker cables for my studio monitors, they don't get much abuse but seem to be well made, and were pretty good value too IIRC.