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Zbrush can handle a million poly on most any machine. I've got 2 gigs of ram, but I had Photoshop, Dreamweaver, Hex, Firefox, email, and a few other apps running when I did that test image this morning.
either way you do this, will require a bit of planning before you start. If you just start pushing and pulling polys around without a clear plan you will end up with lots of unneeded geometry. You could retopo with Zbrush or you may even consider, nurbs, though I don't work with them much, but I think you can remesh your object after you have a design that you like.
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