So they are giving you $800 for the tranny plus labor?
If I've read this right, I would consider ponying up the extra 2 grand to get a reman with a nice warranty with it. Remans typically have a better warranty than a new part anyway and sometimes design defects are corrected during the process.
In the long run, it's far cheaper than a new car and you will have some peace of mind going forward.
I know this is a bitter pill since you already paid for the "warranty" but in the long run it may end up saving you money/stress/hassle down the road.