I'm planning to get a SS in the next month or so just to ride around town. I don't feel I need to take my roadie if I'm just riding into downtown. Also I'm a bit paranoid with leaving the Scott locked up for too long. Trying to keep it sub $400 and I've narrowed it down to a few choices:

Dawes SST-AL
Seems like a pretty good choice. Aluminum frame and a carbon fork for real cheap. I've seen around here that many people don't like aluminum for their SS/FG. What's the reasoning behind this?

Mercier Kilo TT
Obviously a must-have on the list. I've noticed the sizing is super weird though. Looking at the sizing charts between Mercier and Scott, I'm a 50cm in Mercier (due to them not having a 51 or 52), whereas I'm a 54 on my Scott.

Windsor The Hour
Significantly cheaper than the first two. Leaves extra money for other stuff, but is it a good starting platform?

Motobecane Track
Same as the previous.

What do you guys recommend? What would you buy? Thanks for the feedback guys.