So you want another fan at the front of the case, but because you only have two 5.25" bays, you can't use a standard 120 mm adapter, and instead want a 2x80 mm one?
The first problem that I see with this idea is the fact that 5.25" is 133 mm. Two 80 mm fans side-by-side are 160 mm. So if you want a double-fan configuration, you'll have to drop down to 60 mm ones.
In this case, perhaps you need something like this:
http://www.newegg.com/Product/Produc...82E16835230005