I still have my WinMo Samsung Omnia I910 for VZW and am on my 8th replacement in slightly over 16 months. I have conceded that I will never receive a different device. At one point they offered to move my upgrade date up, I would receive the two year price and pass up my New Every 2 $100 additional discount. Additionally they said they would meet me half way if I chose a Moto Devour. That was after my 7th replacement. I did not really care for the Devour, and at that time I knew the Droid was getting a little long-in-the-tooth. It would also reset my upgrade date.
I had to get to replacement 7 before they were even willing to offer anything else. I would have imagined they would offer the Omnia2 as a straight warranty swap, but that never happened.
The best advice I can give you is to give customer service a call and explain the situation in a calm and rational way. Perhaps they will be willing to do something for you. It helps if you have been a customer for a long time and have a high monthly bill. Remember the customer service reps are people just like any other-- being rude very rarely helps your cause, but being too nice (which is my problem) does not help either XD. Sometimes you can bluff them into thinking you're going to cancel-- but sometimes that backfires and also it is an old trick which very rarely works (particularly with the new $350 ETF for advanced devices).