New fly line recommendations

Mainly for swinging big streamers for bull trout. I’ve got a 7wt rod. I’d like a floating line that would work good with adding different sink tips. I haven’t really targeted bulls before but I was advised that a 5wt may be to light, so I dug out an old 7wt rod from the closet and it has no line. Suggestions? Mainly fishing in the elk valley.

Rio versitip is a pretty solid choice if you want to use sink tips

What length rod? If long enough you could probably get away with a single hand spey line as well.

Only a 9 foot. I was thinking the versa tip or maybe the Wulff ambush.