So I have an option to purchase the rMB P 13" and I'm looking at the 2.6 Ghz i5 w 256 GB At the same time I'm wondering if it's necessary to have the i7 3.0. I dont need the added firepower as I won't be gaming on the machine and the price difference is negligible as a company is subsidizing most of it. But I intend to use it for 3 years, and hopefully more. That's why the i7 could do me good over the long run. I'm just concerned if battery life will be significantly decreased by the i7. Only thing is its a CTO so it would take me 4 weeks as I'm purchasing from a retailer that will give me free Office for Mac. But my current MB P is working fine so don't need it in a hurry. Should I just go for the i7?