Hey David
Maybe some of our hundreds of dealers and flippers will chime in a little. Most of us do at least a little selling/flipping so it's not like we don't have some experience. As for grading the T3's. For me, anything to get graded is an easy decision. If you feel you will get your grading fees back plus at least a few more dollars, then it's probably worth it to do it. So if your T3 is worth $100 ungraded but $200 graded, then you made a nice $40 on the decision. I realize this is a very simplistic methodology but I think it's the right one, at least for me
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On the magazines, I don't have any experience, but seeing the way those kinds of things go I would say all in one lot might be best, unless there is something extraordinary about certain one(s). Good luck!!