The top of the line vexilar, Markum and Hbird will all get the job done, and done quite well. For this reason, you will find that flasher owners and fiercely brand loyal!! Personally, I have used vexilar Fl-8's and Fl-18's and now own a humminbird ICE45 and definitely prefer the bird for it's modern features.
No matter what one you end up with, you will love it, and wonder how you ever fished without it.