Hi
Unless you are going to be running really high powered software like Adobe Photoshop, Illustrator and Indesign all at the same time an i5 processor is all you need, my friend has a i5 Gaming computer that is lightning fast.
If you are going to get a new computer now, I,d go with and i5 processor and 8 gigs of ram, if that's what your options are.
By Notebook I assume you want something smaller then a 15" laptop computer.
This limits options somewhat, most computers labeled Notebook have somewhat more limited options then a standard 15" or 16" laptop, it appears that small laptops with 8 gigs of ram and an i5 processor are pretty hard to come by, and not cheap.
This is about the only moderately priced one I found...
Link...