Hi all, am looking for advice on buying a commuter bike. I'll be commuting ~ 5 miles to work and am pretty new into biking (only have a $400 mountain bike at home). I want a bike that is really light, but has the capacity for racks, panniers and fenders. I'll mostly be on paved roads with traffic and will be biking a lot in the rain. Bikes i've been looking at: specialized tricross comp, trek FX 7.7, and cannondale quick SL1. Any advice? Opinions on drop bars vs straight handlebars?

Cheers.