i use a gralab 300 for processing film. it looks like a giant black clock with markings from 0-59. it glows in the dark so when i'm running sheet film i move it beyond the fixer tray and angle it toward to wall. so far no film fogging issiues. i throw a towel over the timer when i'm loading film. it's really simple to use, great for running film but i wouldn't recommend it as a enlarging timer.
for enlarging i use an old lectra or beseler audible timer, but julian's timer sounds great!
which ever timer you do choose for printing make sure it's a repeating timer or you'll go crazy :-)