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Mine would probably be Tony Taka (Hurr durr...wait, how come nobody's mentioned him already?), but I have remarkably few works of his in my collection because all I can find are scans, and since scan quality can vary so much I don't save them.
I like Shiroganeusagi and Haik a lot otherwise, mostly because they save the majority of their work in PNG format (Because lossless is MOTHERFUCKING IMPORTANT). Naomi seems to have made a transition to PNG format as well, so I guess that works too.
As for artists I actually have some method of contact with, it'd probably be Doomfest, RiceGnat, and Emi-Tan.