As long as you've got more exhaust than intake, air will be drawn in through the front vent and across the hard drives, even if there's no fan there. With 2 exhaust (the rear one plus the PSU) and one intake, I think your hard drives should be fine regardless of where the intake fan is installed.
As Heiwashin notes, since you are using a discrete video card, having the intake fan on the side may be preferable. Passively cooled video cards do tend to run a little warm...
Edit: It isn't clear from the pictures at Newegg whether a front fan is even supported... it looks like there may be mounting holes for it, but the front vent looks too small to properly accommodate a 120mm fan.
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