Based on your history you are among brothers on this forum. As for the display I think it comes down to personal preference. I have a 15.4 and love it. People who get the 16.1 have the same feelings and are, in my estimation, in the majority on this forum. When I purchased my AW I wanted a wide screen format so the 16.1 was not a serious consideration. The two extra speakers are nice but I do not believe that they are a phenomenal addition to the AW experience. What I love about the 15.4 is the extreme clarity and the wide viewing angles. Quite simply it is beautiful and makes me smile every time that I open the lid and turn it on. I highly recommend it.
As far as specs go ... the 15.4 is a Hitachi display (same as the dell 8600).
Viewing angles of:
+/- 65 degree (horizontal)
+/- 50 degrees (vertical)
and 35 ms response time.
The 16.1 has been reported to have a 45ms response time on this forum, but I don't know any other specs.