Have you tried telling him that since it's so important TO HIM that you have digital TV that he should be the one to buy you the new cupboard you would need to get it and that he should pay for the whole digital TV service? I've often found that the "I'm perfectly fine with what I have right now but if you want to give things to me as a gift, it's all right by me" attitude to shut people up quite effectively. No offense to your father though.
As for what is pissing me off: people who are making way to much food for the holidays (year after year after year) and who are pushing the leftovers to others since apparently, they don't "like" leftovers.
I'm looking at you, mother.