I love that last part about asking her to respect your decision to remain here.
You could add
"I ask that you respect my decision to remain here instead of attacking it, just as I have respected your decision to leave both the home and the marriage."
The only part I would take away above is :
I am taking a consistent stand and position that I will remain in the first home of my own until I am able to either refinance and buy you out, or the financial situation is no longer sustainable.
Don't tell her the "until I am able to either refinance " etc.. You are giving away your plans there... She will taunt you further for that.
I don't know how it works in your state, but here in Canada the buyer of a home is anonymous until after the sale is final... so you can buy your wife's home without her even knowing until she signs an agreement for the sale.
Don't tell her you want to buy teh house or she may hold out longer for a higher price just to spite you.
