I love my 103 and am currently converting all my Blu-Ray's to MKV or folder structure for the ones where I actually want the extras, since my Sony 7000es 400 Disc Blu-Ray changer keeps breaking.
I have to admit, I wish I would've purchased the 105 now due to its superior DAC's and sound quality and since I require no "room correction."
Considering the road you're on with acoustics and that you may find yourself no longer needing Audyssey (you'll always need some EQ for bass, but that's easy) you may wish to consider the 105 as well.
It's also available in silver now!
Let me know if you have any questions or if I can be of any assistance. If you do choose to stick with the 103, I may be upgrading to the 105 soon, so let me know if you're interested in a 2 month old perfect condition 103.