The Hour is the best of the options you presented. Crmo frame, the others are all hi ten steel. Tools needed for assembly would probably cost you all of $10. You need some allen wrenches and wrench. I've never bought a BD bike but I think you just have to attache the front wheel and handelbars and check that everything else is tightened down. You should be able to watch a few videos on youtube and figure it out for yourself. Assemble and ride and take it in for a tune up down the road. If you aren't comfortable, any LBS will do it for you and shouldn't charge more then $50 to set it up so even if you go that route you at about the same price or less then the others for a bike with a better frame.
I would account for another $50 for two different locks if you plan on locking up after dark especially if you leave it over night, unless you live someplace with zero crime