New 11" MacBook Air + Upgrades.....worth it?

Hi guys!

I want to order a MacBook Air 11" for Office, Illustrator, Photoshop, Lightroom and a little iMovie (not much). I´m going to buy the 128GB Version with 8gigs of RAM. The difficult question is if I should choose the i7 over the i5. Is it worth it? I want to use the Air for at least 3-4 years.

Help me guys!

Greetings from Austria...