A bit of background: I just completed my MA at a large Canadian university, and I will be starting my PhD in Sociology in the fall (at the same large Canadian university). Over the course of my 2-year MA, I worked as a teaching assistant (TA) both years, and also held 6 different research assistant positions with different faculty and projects.
For my PhD, about 30% of my total funding is tied to a guaranteed TAship for the next 4 years, so I will be working as a TA no matter what. As the summer progresses, I've started to receive offers for new research assistant positions in the fall from faculty in my department and other affiliated departments. Currently, I have 3 offers. They're all very part-time (a few hours a week each, tops), so I could theoretically accept all of them from a time-management perspective. I held 3 positions simultaneously in addition to my TAship in my MA and did not find it overwhelming, nor did it compromise my academic work in any way.
Before accepting, however, I've been trying to calculate the cost-benefit analysis. The extra money is definitely nice, but I have enough funding that I could survive without it, although my finances would be tight. Overall, how valuable this experience would be to my career is a bigger factor than the money.
With all that in mind, is accepting as many research assistant positions as I can manage (without compromising my other work) a reasonable career decision in terms of what future hiring committees (in the humanities) would likely be looking for? Again, I'm in the Canadian context, and my understanding is that most positions are seeking a solid mix of both teaching and research experience here.
Does the reputation/prestige of the faculty members I am working for matter in this case? (The way it would for an advisor?)
I recognize that one of the other major factors is whether or not taking all of these positions would compromise my ability to publish, but the flip side of that is that it's not entirely uncommon in my field for research assistants - especially at the PhD level - to end up co-authoring papers with the faculty they work for, so it may actually open up more doors for publication. I have two small/less-prestigious publications accepted so far (an interview with a senior scholar in a journal, and a chapter in an edited book), and I'm working on two others currently that will be submitted to peer-reviewed journals, so I'm in okay shape as far as publications go relative to where I am timing-wise in my career.
Sorry if that's too much context, just trying to be thorough!