chocoholicnomore - the only way is to find out by testing, there are quite a few members who are fine with Burgen Soya & Linseed bread, doesnt make them spike.
Others, like myself, need something even lower in carbs, therefore I bake my own bread (recipes are in the low carb section, incl a 3 minute microwave one).
I have never tried Nimble bread because I found it to be rather flimsy looking, I need something I can get my teeth into.
I would say to try out different breads and test your bg 2 hours later, you will soon find out which bread is best for you.
Incidentally you still can have chocolate, I have posted a whole load of recipes for home made chocolates and chocolate cakes in the low carb recipe forum, guilt free treats they are.
All the best