I'll go back to the 16" size when it trims down a bit. I find the size of the 14" to be absolutely perfect, and I can hook it up to an external monitor when I need the absolute largest screen possible. Speakers and battery life are indeed better on the 16", but it's diminishing returns at that point IMO. The screen is huuuuuuuge, and that's awesome, but so is the laptop (in comparison to the 14"). Just weighs too much, I think. 4lbs was the sweet spot.
Here's to hoping for a 15" goldilocks model
I've never really had my 14" get warm, but I use it primarily for media consumption and web browsing.