If you're getting a GF4600, stick with it!
I do all of my modeling and animation in Maya with a Radeon 8500 and it is definitely fast enough.
Oh, and you can also soft mod your GF4600 into a Quadro card, just to a google search and you'll come up with all sorts of help.
A true "workstation" card will cost you significantly more if you're trying to outperform a "gaming" card. About $1000 more.
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