Thanx, AmyC...
Unfortunately, I think my research has led me to a (more) correct answer. My stocks outperformed the market last year, and my total income exceeded $550k. Accordingly, it looks like the mortgage deduction doesn't apply.
I'm STILL not quite sure this is correct. However, I cannot get TurboTax to acknowledge the $20K in mortgage expense as being "better" than the the standard $25K
