fragicide Instead of a i5 over a i7, look for a dedicated graphics card if you plan to to do graphics work.
I5 -> I7 is like +200.
You're using the terminal, you could very easily get by on a $300 laptop. I mean really, if you need to do heavy work, buy a VPS or a desktop computer and render everything on it or use parallel to have things rendered in many different locations at once. I mean in the terminal, if you're doing stuff here, there, it doesn't really matter. You know that!
Overall, I suggest going for about $400-500 for a i5, buying two 8gb of ram (it's always worth it to buy more ram for linux. I have 9.3gb cached right now 🙂), a dedicated graphics card (any cheap one possible - that will speed up graphics work much more)
Oh yeah, use terminator 😉