Hey guys,

I'm trying to decide between these bikes:

Windsor $500 - Save Up to 60% Off Shimano Disc Brake Flat Bar Wide Tire Hybrid Bikes | Fixie | Windsor Bikes - The Hour | Save up to 60% off Hybrid and Shimano bicycles
OR
Marin Fairfax $500 - Marin Fairfax SC4 2013
OR
Motobecane $700 - Save up to 60% off new Hybrid Bikes Motobecane Cafe Sprint
OR
Cannondale Badboy $700 - Cannondale Bad Boy 9 Bike - 2014 at REI.com
something else??

I'm looking for an aluminum frame, carbon fork, disc brakes and some gears for hills all in a hybrid flatbar bike (leaning towards road) budget of $500 or there-abouts. I'll be commuting 6miles round trip mostly on roads, cutting through a few grassy areas and climbing a few hills.

Does one stand out as the obvious winner? Or do you have a better suggestion? I'm leaning towards the fairfax right now, but any help would be greatly appreciated!