I like the Arva 9000 - it's digital, so I can search very quickly, and it has a lit display, so it works in the dark. It has both an lcd distance display, signal strength lights, and beeping pattern (faster when you get closer).
when I race people with analog beacons, I am faster. the tracker dts is the only one that can beat me, but I understand that it's range is less. Range is also highly dependant upon depth of burial and orientation under the snow.
jason.