Thanks Joe, I just lack confidence I think.
I'm not a gambler and I get really scared when I am faced with decisions like this, a bit of a woose really

comes from the extremely precise nature of my work
When I write code I want it to work and to make it work I have to understand the problem in minute detail otherwise I will miss something and think everything is ok until it comes time to demo my code and something I failed to think about blows up in my face
Still going to get in touch with the IAS as I think that might be the best place to ask the "What if" questions.
Jim