BlackHills, I do understand.
For the first 10 years we were in our (crappy 1923 tract) house, we did everything ourselves. We had time, and little money.
In the past 3 years, we have had more money, but very little time (both in demanding jobs, DH now owns his own business). We have paid a boggling amount to do things on the house that were either complicated or time-intensive. Such as the roof, the stucco, the re-wiring of the entire electrical system, new DRm furniture that we'd wanted for *7* *years* and a professional paint job.
We struggled with spending money too. But for us, it was time to spend the funds on things that were 1) aesthetically wanted, and 2) necessary to keep the house from decaying further.
So - if you've researched it for 6 months, you have savings, you have retirement funded - perhaps it's OK to buy the new TV. In your shoes, I'd balance it by donating the old one; shopping for a killer deal on a model that might be last year's release; and calling it your Xmas gift to one another.
PS: FWIW, we still own that same TV - it's 32", and ~ 8 years old. No new LCD or plasma for us. If it ain't broke, we keep it. And sometimes, we keep it even if it *is* broke!