Spiders are my favorite low-end morph. But if you're willing to spend the money on a pewter, you may as well get a bumblebee. They're roughly the same price (bees may be a little more, but not by much). Since it seems like you're looking to breed, a bee might be a good choice because it's a double trait. It's like breeding to a pastel and a spider at the same time. You get more variety in the possible offspring.