[Victoria]

My two cents: I think your logic 'failed', because you tried to justify the purchase, by focusing on your wife, and 'her' tv - that's guaranteed to make the other person feel defensive.

Just stick to 'you'. Tell your wife how much you'd enjoy it, why adding notes are important to you, or why the larger screen size would be helpful. Give her an opportunity to feel the warm satisfaction of knowing you would have pleasure - she cares about you - rather than try to make her feel badly about watching tv - which it sounds like she already does.

Sometimes discussions aren't about logic, they are about feelings and relationships.