When the saddle gets fairly old and the leather has stretched, you can use the tension adjustment to tighten up the "hammock." The most common advice is 'leave it alone.' Mine is 7 years old, and I've used the adjustment to stretch it maybe 1/8", total.

That's a good price, doesn't matter which model. Care of a Brooks is (like everything else) a matter of debate. I say follow the manufacturers instructions... a thin coat of Proofide roughly once a month. (After it's set overnight, there should be little or none to wipe off.) Sheldon Brown recommends soaking new ones in neatsfoot oil overnight (who am I to argue with Sheldon?). DO NOT TRY TO SOFTEN THE LEATHER. The beauty of them is that they mold to your form. If/when they mold too much to your form, they can start applying undue pressure where you don't want it.

There are people who don't like Brooks. I like mine (B-17 Champion Special) for long, leisurely rides, but prefer something with a narrower nose (and lighter) for shorter, faster recreational rides. Alas, I can't use it on my commuter, since the leather rubs off and browns my trousers. Another thing about the B-17, at least, is that the way the rails are bent, you can't slide it back as far as some saddles, and it's wide which forces you to sit farther forward, so it requires a seat post with ample set-back.

More than you wanted to know. They're very nice saddles, enjoy yours!