Sojourstar, Steam’s size may not be such an issue since it is doubtful you’ll need several versions of ePic on the same computer.
Therefore once you’ve seen the Steam version in action, you can decide if you want to keep using this ePic (and uninstall the standard one) or on the other hand uninstall it and revert to your usual non-Steam ePic. 🙂
Should save some space.