512SSD/8MB/i7 MBA to replace my Thinkpad due to poor quality. Will run Win7 Pro via BootCamp. Hoping I will not regret not getting a 15" unit but need something smaller for field use and the MBPro is just not required. How much hard drive do I need to partition for iOS to allow for updates, etc. Will seldom use iOS except for FaceTime. Also, even though this has the i7 processor, can I expect to get 5-6 hours of on and off use during a typical day.