If you we were me, how would you customize this for maximum performance?
Apple is replacing by current macbook pro 15in because its having issues.
Sending me a brand new one, and they will let my upgrade that base unit and pay the difference.
What do you think?
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Sorry to hear you've had problems with the MBP.  I would not buy my ram from Apple.  Get it from Crucial.com and save a little money.  But you'd need to look at the price difference if you are only upgrading.  I'd move up to the 7200rpm hard drive for $50 more.  SSD is cool but still way too expensive for the mainstream.  

also what about the upgraded antiglare screen? Will that allow me to work outside better?

Oh yea.  I, along with all my professional video and still image friends, think the matte finish is a must and I'll go with that "anti glare" finish until my dying day.  I hate that Apple wants to charge extra $$$ for a feature that was always there in the past.   The glossy screen is beautiful but a pain for 80% of the enviornments you're in.  Sorry I forgot to mention that.  I usually don't recommend that unless people are interested in it.  Most people fall for the "oh it's so shinny" effect.