It's been awhile since I fished like that, but I used to really like
the Thill center slider - the smallest or next-to-smallest ones.
What I really liked about it was when you got the right amount of
weight on it, just the red band above water, you could "jiggle" it
and pull it pretty aggresively without it going under. Tried the long
waggler floats, and every time I twitched the rod, float would go under.