Eweka. Not only the biggest backbone (afaik) but they also regularly have a supercheap offer like 2.50 with vpn and all. Speed is constant with only very rare occasions where it gets down to "just" 100mbit or so. 50 concurrent connections.

Indexers i tried many, but got stuck with geeknews. Would say i find 99% of what i search there. Price is 12 bucks per annum i think. With even a free tier. I don't even know the name of the other two as i never need to use them, they're just backups now and i will cancel them