It takes the N8 off the table for me, but I'm still watching the thread. I was kind of leaning toward the gold Sony for battery life and because lower heat devices tend to last longer.
I already have the black Sony and I am quite happy with the NW - WM1A. The N8 seems like a fascinating device having said all that.
Let's hope you can audition our N8 in near future.
Regarding the issue "lower heat devices tend to last longer", I would like to offer a different observation.
From engineering point of view, the critical issue is to get the heat OUT as efficient as possible, For instance, the CNC Stainless Steel chassis of N8 act like a big piece of heat sink, and we have apply PGS to heat generating components to increase the efficiency of heat dissipation and spread the heat across the chassis evenly. As a result of that, you'll feel the heat of machine. You might not like it and worry that the player will have a short life because of that, but that's the right thing to do.
Let's illustrate this concept with some figures. Because of what we have done, we can control the temperature different between the internal (circuit board) and external (chassis) of N8 to 5°C or less. The temperature of N8 chassis is between 36-40°C during playback, so the internal temperature will be around 41°C to 46°C. On the other hand, If we didn't management the heat correctly, the temperature different will easily go up to 10-15 degree. In other word, when the chassis stay cool at 32°C-36°C degree, the internal will go up to 45°C-50°C degree. It is obvious that the first option is a better outcome despite users will worry about the heat problem.
Having said that, the modern electronic components are designed to operate at a much higher temperature. google the operation temperature of the key components we have published and you should not the following:
PGA2311UA, -40°C to 85°C
OPA1622 -40°C to 125°C
AK4497EQ -40°C to 85°C
MUSES02 -40°C to 85°C
If the operation temperature of N8 is around 45°C, its probably is very hot for user experience, but it probably won't cause any adverse implication to the product operation life.