Tbh, the computers on the lot right now are (for most users) enough for anything that the world might throw at them in the next four years. This isn't like back in the day where 512mb RAM was the standard and the annual changes made a huge difference.
Really, the specs right now are enough to play movies, word process, play music, and do all the little things that most users need simultaneously without lag anymore. The only difference between a whitebook, blackbook, and MBP really is the everything graphic related.
Note: The 4gb ram upgrade will NOT be worthwhile (even if you buy your own RAM and install, which you should, money wise) as you don't 'seem' to be needing anything that heavy and you probably won't see a significant difference without doing film/photo/audio editing etc..
Here are a couple things I've gathered. Please, for you or anyone who reads this, these are just some thoughts on
possible weaknesses, nothing concrete, don't bash me
MBP:
- lower wifi range (more wifi problems reported)
- More 'heat' problems, aluminum casing is the cause.
- Though touted as a better screen, it has 'more' screen issues and bugs
- Keyboard is not the chiclet keys, take that how you will.
- Hard drive is harder, thought not impossible to upgrade manually
MB:
- Mediocre integrated graphics at best
- Gets dirty easier, doesn't matter which color, both have specific issues
- No backlight on screen or keyboard
- No multitouch
- Internal speakers are poor, even for laptop standards