I use a MacBook Air with Serato.
Digital Mixers:
Denon MC6000MK2 with four simultaneous digital tracks
or
Novation Twitch with two tracks
Specs on the MacBook Air:
OSX Version: 10.9.4
Processor: 1.86 Intel Core Duo
Memory: 2GB 1067 MHz DDR3
Disk: 128G SSD
I originally wanted to see if the MacBook Air could handle the Novation Twitch since it is a more compact mixer, easier to put in a bag and go. I can fit a laptop, the Twitch, laptop stand and all cables in one small laptop bag. Then I just have speakers to carry – using KRKs – and I’m ready to go for a small impromptu gig.
The MacBook Air works well with both mixers, even the Denon with four tracks running. I think with the specs you listed you would be right where you want to be with the Twitch, especially if screen size does not matter. That was the one thing I missed from my 15″ MacBook Pro, so when I am at home in the lab I use the larger screen on the laptop.
Hope this helps.