I have just recently bought the below:
I use mine for buiness (working from home, keeping in touch via email and amending word docs / spreadsheets etc). I guess it depends on the size of memory you need and also the screen size, if you are not going to be editing video etc I'm sure you'll be ok with the 13" screen. You can of course always purchase memory drives / portable hard drives if you require more memory at a later date.
If you want to save money then I would suggest the first option.
As far as the Microsoft Office goes I am unsure of the exact difference, I bought the follwoing:
I find this great, it has everything you need really, I actually bought it with 2 other colleagues so it worked out much cheaper.
I hope this helps (alittle).
Kind regards and good luck.
Would that be the MacBook Pro 2.5 GHz?
I more than likely going to purchase the 2.5 GHz because the RAM and other specs are only noticeable when editing video or playing games.
The Licensing merely means how many times it can be installed. The one I will be purchasing is the Academic edition, so it has everything the business Office has for a lower price.
Thank you for your answer. It actually helped a lot on my research.