I think you'll want the laptop... whether or not you can bring it to school, you'll like taking it with you around the house or on your bed, and it's fun to bring over to a friends house, etc.
Also, don't let anyone make you feel bad for getting a nice computer. There are a lot of posters here who seem to resent anyone who wants more than the absolute bare minimum. That being said, I agree with other posters that it's better to find the sweet spot on specs without going overboard.
Personally, I like to spend a little less upfront and upgrade more often, rather than spending a lot up front and expecting your laptop to last five or more years. For instance, 8GB RAM should be good for your use for the next few years. You didn't mention anything about the SSD, but I'll suggest 250GB minimum, and I'd definitely recommend 500GB before getting 16 or 32 GB RAM.
Good luck![/Q`thanks `I Think I will take the rMBP 13 inch and in a year or 2 I will buy a 27inch iMac because i do not need a very powerful laptop but require a powerful desktop for gaming etc but I prefer mac OSX to windows because windows crashes alot
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