I've decided to pack in the Splitgrade system because I feel its not making me think enough about my printing. That and the prints I've made using it manually on grades 00 and 5 are much more pleasing than the ones spat out by the densitometer. So I'll be looking for an f-stop timer that works with a Durst laboratar 1200. Could people give me advice on what to look out for? What are the best timers available for the money?