Also to expand on what I said here, I would go for a thinkpad with an i5 at least. I am on an i5 and I wouldn't want it much slower but it doesn't need to be much faster. Its seem the i5 a good trade off for running quietly and running fast. Fan noise is a thing with a thinkpad but you can't hear it even at max if there is any kind of ambient noise in the background, light hum in silence. An i7 is probably over kill for basic needs but if you don't need consistent up to date graphics, if you were to get an i7, it'll probably last you a very long time.