'I suppose that is what my true question was, is there any reason/other watch to not go for the TC sub.'
In my view the TC Sub is good value for money, by the time you buy the watch and then add a Gen insert your in for over the $700 mark though (with shipping fees etc mine is $750 gen insert brand new) but I have had a couple of subs and I always look to them for everyday use, I'm no rolex expert but they look bloody good and have that quality feeling to them too just waiting now for the V3 bracelet!
Go buy one rbt