ASUS Vivobook S200 / X202 (Is it good?)
I had a similar dilemma, and ended up going for the i3. To be honest, I am VERY glad I did. Even with the i3, it feels a little underpowered, but still usable.
(Note this is a 8 reference, I haven't done OSX yet, too busy).
It is still a VERY nice machine though, so very usable, and give it six months and I'll pop a SSD in there to give it a helping hand, but obviously, after that, you are out of upgrade space (fixed RAM), so just consider pushing that budget another 10-20% and getting the i3....
I have a feeling this is going to be one of my favourite machines for quite a few years..