so were both saying the same point :-)
No, you said the i7 is newer, and you're simply wrong (that's like saying Avalon is newer than Camry).
Either way, even if i7 is a faster processor, it isn't always the best way to go (for less heavy users it might be better to go with i5 which might not drain the battery as quickly. In the OPs case i7 seems to be the way to go (as Name Changed said).