@Paul C. I personally like this deal. I am not sure exactly where this is at but if you are in Marietta and sandwiched near homes that are worth 350K+, I think you found a good little first base hit that will teach you a lot and help propel you forward to future deals.
Don't let people beat you up on it. Duplexes in Marietta are hard to come by and finding a property that you are comfortable with living in (thats not in a sketchy area) would cut down your options even further.
Your rent projections aren't "crazy off" and I have friends that would personally pay around this price per door to rent out something in this area. See below rental comps just off the MLS for duplexes 5 miles from Marietta. Pretty spot on. 
If you get this rented out on both sides at $1500/month, then your projections of it being worth over that 300K mark are not far off either. A lot of BPers are extremely value oriented, especially wholesalers ;) , and may not take into account all of the reasons that this deal is a solid base hit for you. Save on costs by doing some of the work with the wifey and relish in the fact that you are taking action on this. Some people in these forums may not even own properties.
Beats the heck out of sinking money into a large personal home or continuing to rent for the next 5 years.
Please don't hesitate to hit me up if you ever need anything man and good luck on future deals!
