Need more help to decide between 250 or 1500 I hear the 250 will sweep faster then the 1500 and will find things as good as the 1500 without the imaging I am looking forward to get started but I need to know without the imaging is the 250 just as good as the 1500 in finding things is there someone out there that used both and can tell which is better or they both are equal except the imaging thanks.