Sink tip lines. Need some education

[lds]

So never really played with them but I’m gonna get one for my 5&8wt. Not really anything specific I would be using them for. Deeper rivers for trout, lakes for pike and Kokanee and who knows what else. Maybe some saltwater. What would be your recommendation. Not looking for anything expensive as I’m a low budget guy and have always bought cheep lines and never been disappointed. More looking for advice on speed of sink. I would probably go with 2 different speeds. Intermediate and fast? What’s your experience?