Help me in buying a Mac book air.

Question

P1 )1.3GHz Dual-Core Intel Core i5, Turbo Boost up to 2.6GHz [Subtract $150.00]
                                                           VS
P2 ) 1.7GHz Dual-Core Intel Core i7, Turbo Boost up to 3.3GHz
R1 )4GB 1600MHz LPDDR3 SDRAM [Subtract $100.00]
                                                                  VS
R2 )       8GB 1600MHz LPDDR3 SDRAM
Let me know the significance of posible 4 compinations.[ {P1,R1} , {P1,R2} , {P2,R1} , {P2,R2} ].
My activities.
1 ) Win7 and MAcOS X (DUAL BOOT SYSTEM).
2 ) Playing posibble games capable by intel HD graphic 5000.
3 ) Xcode.
4 ) Movie playing.
5 ) Word processing.
6 ) MATLAB
7 ) Final cut pro

Answer 1

I5 Processor and 8gig ram since youre playing with Final Cut pro
I7 reports are getting 35-40% less battery,  my own test with my friends I7 proved same too.
All bench tests showed the only REAL place where there was noticable diff. between I5 and I7 was in Photoshop.
Id rather have 4 seconds slower processing speed on VID edits than lose 4 hours battery life on an I7 processor in which 98% of programs will have NO noticable speed increase on the I7 over that of the I5
As far as movie playing, even BLURAY rips, given the SSD, even my OLD macbook Air never hiccuped on those.......the new Air i have is blazing faster on read / write.