Upgrading to Touch Pro off ebay? Please Help.

[cbutters]

Hello everyone, I am an owner of a Touch Diamond; I recently had my vibrator on the phone go out and the Sprint Technician said that it cannot be fixed so they are going to order me a brand new Touch Diamond.

Here's my question: Since I am getting a brand new phone, I want to sell it on ebay and then buy a Touch Pro off ebay and use that (I always kicked myself for getting the diamond when it first came out and then the touch pro came out and I had keyboard envy!)
So I understand the OS and hardware on the phone pretty well, but have no idea about the whole ESN clean vs dirty and whatnot.

When I receive this new Touch Diamond, Im sure they will swap my account over to the ESN on the new touch diamond. If I buy a Touch Pro off of ebay and want to sell my diamond on ebay, how do I sell the touch diamond with a "clean ESN" and how do I move my account to the new Touch Pro that I buy off of ebay?

Also, does anybody suggest waiting for the HTC Hero instead?

Any suggestions or comments are welcome, thanks a lot.