Easy on Legacy Park.....big REO numbers in there including many more headed that way. Nice community in terms of layout but value-wise I see it still falling for a bit. It's one of the communities that's not faired well as many newer ones followed it and it's showing it's age.
There are options in the area but you need to really focus on data trends. I say this from the other side of the fence as well as sales - I'm a foreclosure appraiser and spend a fair amount of time in Kennesaw-Acworth.
If you're interested, pop me an email with more specific details, I can offer suggestions. You might find my data section on Kennesaw useful - http://hounddogrealestate.com/atlanta-real-estate-conditions/kennesaw-ga-real-estate/
It's all micro market work so the more detailed you are the better data you'll see,