Any of these would probably work, but I will tell you what I would do. I would get a SJ and build a mini WSM and take that with me. From personal experience, I spent 6 weeks on a job a number of years back and a co-worker and I lived off a SJ Gold the entire time. We only ate one dinner meal the entire time that did not come off that little grill. That was even before I built the mini WSM from it. Having a smoker available on top of the grill adds a whole new dimension. The advantage of the SJ Gold is that it can be totally closed with all the dirt locked inside. The downside is that generally speaking it won't get as hot as some of the other options.
WSM, 2 -Performers, 2-OTG, SJG mini WSM, Summit 420, Q100, KJ Classic, KJ Jr, and Schwenkgrill