I'm looking to purchase my first decent bike.

I've been doing some reading and it looks like the majority of my riding will be road/pavement with some gravel/dirt/off road mixed in.

Would I be looking at a hybrid bike or a off road capable commuter?

A few bikes that have been suggested to me:

Jamis Coda Sport
Jamis Coda Comp
Redline DS1
Redline DS2

Thoughts? Ideas? Suggestions?

Budget $600-$800.