Thanks for the replies.
The SSD is bought. $145cdn for a Corsair Extreme 32GB SSD (from ncix.com). Should have it within 1-2 days, they're notoriously FAST at shipping if orders are placed before 1pm PDT.
http://www.corsair.com/products/ssd_...e/default.aspx
Plan to put 3x wow folders on it, with only one data folder Sym-linked. That should be less than 20gb total, leaving plenty of room for my windows-7 pagefile.
I know you said you can run one wow installation and launch three instances, but I don't want to do that because my three different instances of wow run at different resolutions, even different aspect ratios, and have different graphics quality and sound settings.
Main runs at 1920x1080 windowed, maximized, full graphics except shadows at minimum
Slaves run at 800x600 windowed, not maximized, absolute minimum graphics, capped at 20fps, and all sounds/music off.
Without running ISBoxer and virtualizing the config files I don't know of a way to do that on one wow install.
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