Sharpie Highlighters

Highlighters, which one is best?

I had reason to pop into Staples yesterday. While there I browsed the shelves and found these, only two quid a pop. I believe that maps are working tools and in addition to removing covers before I insert them into a map case for use on the trail, I have no compunction in drawing lines, making notes, ringing interesting places or anything else I wish, on my maps. I also like to highlight my route. I find it helps to quickly locate the path or route in question. However I always have a problem in selecting a colour that works, mostly because Ordnance Survey do a grand job of using much of the colour pallet when indicating the various classes of road and path, notwithstanding contours and rivers. Pink tends to work for me best but there must be a better colour out there somewhere, thoughts?