Typhoon lambo like a sight line, but not one that is distracting. I have removed the paint from the single line in my current putter so it is usable when I first set the putter on line, but it is not something I focus on when I putt. That's exactly what I'm thinking of doing!! Seems like the perfect mix.
johnnydoom Mine, an old Never Compromise, has a sightline, but I don't use it. It has weighted sections at both ends of the blade that attach in straight lines and I tend to used those to frame the ball and aim with.