I'd go for 6/8 as it's right in the middle of the general shaving spectrum. I started with a 6/8, but now my shaving rotation has a 50/50 split between 5/8 and 6/8.

As for Colleen's stuff, don't get it! It's so good that you'll never be able to get enough! I started off by testing her samples, then I bought a couple of soaps form her.. Now I just placed an order for 3 more (1 is a spare of a soap that I already have in the rotation) and a cologne. I'm HOOKED

edit: list update lol