I have an iPhone 13 and want to get a 15 as I have some Focal Bathys headphones and would be nice to just use the USB C (as apple wont get off their ass and do wireless "proper" lossless audio) - I would want at least 256gb storage and would like the plus model 15 or above - When is a good time to buy used in the next 6 months ? Are we already into Xmas buying time so used prices will rise and therefore should I wait for Jan /Feb time ? Yours thoughts please....