It depends what sort of game you want. Also whether will need to upgrade your computer to run any of these games or not; if you do then you should factor that in, for example I think your system requirements for Wizardry 8 are less than for Morrowind or NWN. They're all quite different games - if you want a game you can play multi with, then Wizardry 8 is not for you, be better to get NWN. However W8 is good if you want something a little different (eg rules, characters) than D&D.
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