I think the best thing to do would be to take whatever samples you have - at the minimum your cabinet & backsplash, but if you have floor & wall paint samples, them too - to a place that sells countertops (if you're leaning toward Cambria, then a place that carries it. Once you're there, you can get samples of the counters you like most (some vendors will give you/lend you samples, or you may have to order them for $3 or $4 each.

Once you've got the samples in your home, you can see what the colors will look like with the rest of your finishes, in your home. Here are a bunch of my samples together, I kept shifting things around & trying new combos, in different lights until I thought I ended up with something that the elements worked together.

Pictured: My cabinets, backsplash, flooring, counter & wall paint.