Best thing to do is get an inspection of your unit with the tenant there.

If there is one, you should also get a copy of the move in checklist/inspection.

Had one offer accepted mid Jan, inspections showed a bad septic, working on price adjustment on that, if they wont give it to us we walk, almost 10k.

Two things I am less confident about are: 1) the construction quality (is it a "cracker box", did the foreman let the guys cut corners to make a deadline or save a buck or simply because he was too busy) and 2) if the home in question turns out to inspect well, how how well the neighborhood is going to fare over time if it's less than 5 or 10 years old?

You asked for input, go into the learn section and review topics of interest, listen to the the library of podcasts and equally important review some of the inspection and cost control forms that are available.

These seemed very minor to me but every one of these items showed up on the inspection report and ended up scaring our buyer away.

The quote was around $1,500 for 3 months (minimum) of full room furniture and furnishings for each room in the house - though I think we could get by less items as recommended by the rental store and get it down closer to a thousand dollars.

I've incurred some expenses with inspections, rental business license, some repair work done, and installed a security system. 

I must get written bids by a licensed contractor that must be submitted to the inspection department for approval to determine repair costs.

It sounds like you're probably getting closer to 30% with these other items added in.