The fact that you have a touring frame makes me think the narrower the saddle, the better. I haven't ridden on a sprung saddle, but here's my experience with Brooks saddles. BTW, I'm a pretty big guy as well.

Had a Cannondale road bike. Was trying to figure out if I wanted the B.17 or the B.17 Narrow. On the Brooks website, they say the B.17 is for a more upright position, and the narrow saddles are for racing. Well, I usually ride on the hoods or on the tops; not quite racing down in the drops, and not quite upright, as with a hybrid or mountain bike.

So first I tried the B.17. On an 8 mile ride, I had severe numbness in my hands and the saddle itself was pretty uncomfortable. I'd never, ever had numbness in my hands before. I was bummed. I tried another ride and had the same results.

Then I decided to try the narrower saddle. I went with the Swift, because I wanted the Ti rails. Well, this baby is the most comfortable saddle I've ever been on in my life. I rode a 60-miler last weekend, and wasn't uncomfortable for even a second. It really is an amazing saddle.

Now, in the meantime, I got a hybrid bike as a commuter. I hadn't yet returned the B.17, so I decided to throw it on there. It's actually just as comfortable as the Swift is on my road bike. I don't go on rides with the commuter that are as long, but I always feel great.

So the moral of the story ... If you're running a touring frame you'll be leaning a little bit more forward, and you might want to consider one of the narrower saddles.

Few more bits of info:

1) I live in Los Angeles, and a lot of our streets are crap.
2) My Cannondale road bike is a pretty harsh ride, and I'm running tires at 130 psi. All the more impressive how comfy the Swift is.
3) Don't know if anyone mentioned this, but Wallingford offers a 100% guarantee. So you can actually try whatever saddle you want and return it if you don't like it.