Welcome to the monkey house.
There are loads of people here that will be more than happy to give you an opinion of what you should or shouldn't do with your car.
Take your time, have a look at a few different cars but any way you go I am sure you will be happy.
The CR is a great kit, I am very happy with mine, but it is an earlier chassis to the current one. Give Harrison a look in and no one could go past Absolute Pace with out at least seeing what they have to offer.
Good luck with your search.
BTW an LS3 is probably the best engine for one of these cars on offer at the minute, and remember Shelby went to Chev first