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Well, as I said, it's mostly custom samples being processed with FX plugs. Only times I use VSTi for drums is when transcribing a source to lay a temp drumline (with tools like 'DSK mini-drum Z'), or when composing cinematic/ethnic music (with EWQL Colossus).
Luckily for you, OCR is packed with talented electronica producers that are WAY better at this game that I'll ever be. Head over to the workshop/production section of the forums and I'm sure you'll find what you're looking for in no time. Good luck.