Thanks for the quick answer.
The dog (a springer spaniel) has in the last few months eaten the watch, two remote controls (including LG smart remote - about £30 to replace) and the wife's new phone! She totally destroyed the watch, there was hardly anything lef!
I think i'll go for the colour screen. The case being bonded is neither here nor there for me. 4 day battery life I can live with I think. I also had a Sony SW3 which I really liked but I bust it the other day (was carrying a bedside table down the stairs and banged the watch on the way smashing the screen and ripping the strap off!)