I'm planning a close re-reading of Marx's Capital and the Grundrisse this summer and in preparation for that would like to gain a more rigorous understanding of Hegel. In a seminar I was recently in, we did a close reading of Capital volume 1, using large sections of the Grundrisse as reference points. As useful an exercise as it was to read Capital closely (it was extremely useful), I feel that looking at some of the passages in the Grundrisse where the Hegelian categories are still being used explicitly (as opposed to implicitly later on in Capital) was really useful for deepening my understanding of Marx. However, there were moments when those of us in the class, the professor included, wished we had more time to read Hegel himself, and this is the thought behind reading him in preparation for rereading Marx.
There seems to be a renewed interest in Hegel among other, non-marxist concerned circles as well and I think this is one indication of why now might be a good time to consider his thought again, and more rigorously. In my mind the way to do this would be to work our way through most of, if not all of, the introductions, which would allow us to engage with the whole scope of his project and its linkages. Re:press has just recently published a nice collection of all the introductions, available in pdf through Open Access here: http://www.re-press.org/content/view/60/38/ which I think would make a good one-stop source text. Also, athough I'm more interested in reading the primary texts very closely and less interested in commentaries, I'd love to hear what other people think would be useful as secondary texts, esp. studies that broaden the historical context, etc.