Hi,
I want to share my experience:
I have
17 inch Macbook Pro 2.4 8600GT
and
15 inch Macbook Pro 2.2 8600GT
And I had an access to 13 macbook (not pro), so I am familiar with it and its weight and specs like it is my own. Plus, I think it can be directly compared to 13MBP
17
+Very good sound, no need for extra loudspeakers, except you always use headphones.
+Stays VERY VERY cool, WAY cooler thant 15 inch or 13.
+VERY silent
+no need for extra screen, even at home. Graphic designers of course would need a bigger screen, and FINAL CUT PRO users would only need an extra monitor (they use two at the same time). 15 and 13 models would need two extra monitors (is it possible?), because 15 and 13 are way to small to handle a part of final cut.
+large battery
+monitor accepts large resolutions
+very good insides
-big and heavy
-expensive
15
+Smaller, lighter than 17, but still big to carry around
+more sutable for students
+good performance
+- 15" is still acceptable, but in some cases an external moni would be a big help
-Loud
-Hot
-bad sound, headphones or loudspeakers is a must.
13
+very portable, light and small.
+good power under a small case, but usually not enough for professional use
+cheap
+-good for college - but this is not what macs are used for. There is a reason why professionals choose mac over win, when it comes to photo editing, drawing, video cutting.
-by no way something you use with final cut pro or photoshop. You can, but with an external monitor only and sometimes, when you need TWO screen simultaneously, 13 inch will only hinder you.
-loud
-hot
-bad sound
-performance is not on "mac" level
CONCLUSION
Now, if to remove the weight and the portability from the conclusion, and have these laptops compete here on my desk, or your desk, 17 inch is the most comfortable to work with. When it comes to watching movies, photoshoping, playing games, the best at it is no doubt 17 inch. It stays cool n quiet, big, but possible to carry around. 15 inches is something inbetween, still a monster, but has its minuses. It is almost as big as 17 when it comes to portability. Despite smaller weight and size, I still have troubles carrying it around. 13 is portability friendly, but unfortunately for me, it is not more than just a net book.
1place 17
2p 15
3p 13
Thank you