Cubase Laptop, No Audio Interface

I’m looking to buy a laptop just for Cubase post production, i.e. I will not be recording on it - just cleaning up midi, tuning vocals, etc. Does this mean that I don’t need to worry too much about latency, graphics cards, etc.? Wouldn’t something like an i5 4200U with integrated A/V do? Sometimes I have up to 80 tracks, though. I’m currently using Cubase 6.5, but am about ready to upgrade to 7.5. Thanks in advance.

I travel a lot and use my laptop with no problems on the built in audio card. It does have higher latency, but since I am not recording, that is never a problem. I just limit myself to editing, mixing, etc., and have never had a problem.