Thanks for all the input guys. I have finally done it and put in my order for a Cobra.

I have gone with the Harrison kit for a couple of reasons. One is Warwick Harrison and the way he has refined his kit to suit a wide variety of builders. If he can make it simpler for the builder, he builds it into his product and he is a Great guy to deal with. Secondly, he is in Qld (home of the premiership winning BRONCOS) and not too far away if, sorry that should be When, I get into trouble with the build...
Thanks again you guys for answering all of my questions so far. So now I have a LONG LONG 16 weeks or so to wait now...
A big thanks to 400TT and 07COB for the tour a few weeks ago.
ANyone have a spare LS1 and T5 lying around...
cheers