What's your inseam? Trek lists the standover for the current 7.3 as 30.5",so your inseam will need to be at least that to ride it. Either Trek will be fine if you fit it. just work with them on the price.
Originally Posted by M_S
Disc brakes have more stopping power, and are better in the rain, they are also heavier, but that shouldn't make too much difference for commuting purposes. They are also bling to attract thieves, so don't get them if you don't need them.
V brakes will stop just as hard as discs. But disc pads last much longer,they require fewer adjustments,they don't wear on rims,they aren't effected by how true the rim is,and they don't get brake dust everywhere. I only commute on discs. And I've never heard any credible evidence that they attract thieves.