I going to do the same. I think the 5.5" is just to big to carry comfortably! And I like the size of my iPad retina. I wish both had equal technology in them. But still it just to big for my needs and hand size. I read they improve the contracts, brightness, etc .... screen quality so the 326ppi looks as good as the 5.5" 401ppi.I have always personally thought a 5.5" phone was too big for my needs, so I will be holding onto my Retina iPad mini and purchasing the 4.7" model.
12.9" iPad would be nice.I have an iPad mini 1st gen. It's my go to internet device. Larger screen full web pages with touch interface that works whilst chilling on the sofa.
The iPhone 6+ will take that functionality and put it in my pocket. It will enhance my daily internet browsing because it'll display more content on the move. I barely use my phone as a phone unless my boss is pestering me or the girlfriend wants to know what's for dinner... The rest of my social life is on Facebook and Snapchat. Which is why the 6+ is the perfect iPhone for me. Screen size over phone usability.
My iPad mini though, well that will be replaced in due time. I was planning on getting an iPad Air 2. However, I may wait and see if Apple eventually comes up with the rumoured 12.9" iPad. Not 100% either way.