I hear some of the gurus speak about using algorithms compiled of certain market indicators and trends in order to track prime markets for  better marketing results. 

If these units are only 10 years old they should be in pretty good shape and easy keepers. i have 100 yr old single family homes that don't take that much upkeep.

Are rents trending up or down or staying flat??

Real Estate trends, Job trends, etc.

The new renter will want it ship-shape if they are any good.

You may lose your lien & get wipe out.Most tax lien properties that do not get redeemed are usually in bad shapes or conditions.

So I shopped around and I got a (now finalized) quote from esurance for only 541 a year ... and their replacement value was 100k higher.Has anyone else noticed this trend with esurance compared to other providers?

Purchase Price: 150,000Mortgage with taxes and Insurance: 740Maintenance cost: 74/month ( had the house inspected and its in really great shape only minor cosmetic things)Total Expense: 814Rent Range: 1100-1300 Expected Rent:1,150Expected Cash Flow: 336Is this a good deal?

However if you can find a deal on a side-by-side duplex in Delmar, your vacancy rate will be near zero, as long as the property is in good shape.

Properties are in decent shape.