Been there. What I finally did was order a couple spools of thread from different companies to try out. Generally, no issues with any of those brands: ThreadArt, Madeira, Floriani and Brother's. If issues occur, a needle change or re-wind of thread usually takes care of the problem (and I don't stitch at the top speed either). As for the most of the less expensive thread unfortunately I found out they would break often, but you could manage to use it by slowing down your machine.