I really should have read your last post prior to posting!
The 17 really pushes the definition of portable. If you only move your computer occasionally, and straight from one place to another, then it's fine. But if you need to carry it a lot, it could be a burden.
To above, nah.
I have had the 17" with anti-glare, for over one year now. It is also what I use in office every day, carrying it in a backpack every day. A backpack makes simple to carry it. I can say that it is by far the best computer I had in my life. Before my 17 I had Windows for at least ten years. There is no way on earth I am stepping back. Mac 1) works, 2) is simple, 3) is far more advanced... and when I shopped around I compared to a 15" Lenovo that was same price range in Hong Kong...
For photographic processing I wish the screen was tad bigger, but... it is a compromise. A 15" widescreen would be too small for me.
I recommend the 17", just go with it. Look at the weights, it is lighter than most (if not all) 17" out there (even comparable to many 15" in weight). Then look at 17" being 2.99kg vs. 15" being 2.54kg. That is difference of only 450g.
All I can say I love mine. Got anti glare and 256 SSD.
Also, I would not recommend the glossy screens for photographic processing, my wife has the 13".