If you settle for an Eris, or a Droid, then you KNOW that when the Incredible (or Droid X) finally does arrive, you'll sorely regret not waiting.
I paid $600 for my Droid Incredible and I'm perfectly happy with it. Not just satisfied, but genuinely enthused with it. It's an amazing phone, even my iPhoning friends admit it's a better phone.
That said, you could always buy one off-contract. I needed a phone ASAP, and they kept extending the restock date over and over again, so I broke down and got mine from a dealer, and paid retail.
If you need one now, that's my suggestion. Otherwise, you'll be waiting another 2 years before you can get a modern Android phone?