Well I came across one that I am curious on everyone’s opinion, the number make since but my biggest concern is vacancy for this property.The reason vacancy is my concern, it is in a very small town(approximately 2500 people), the next closest city is about 10-15 min away of about 55k.

It sounds from your description that it is.However, because you also do personal activities in the room (play games on your desktop), it doesn't sound like this would pass the "exclusive use" rule.Playing the games on your laptop in a different room would likely qualify the room as "exclusive use" as a home office.Also note that in the future if you take this deduction, there is a simplified method you can use to reduce the records you have to keep - just multiply the square footage of the office by $5 (if it is under 300 total square feet).

As long I can trust the Turnkey provider I am concern too much about the market I am getting it, I feel they will know whats best.

Proper techniques and caution needs to be applied to this specific method.  

This means that you could qualify with one method without qualifying for the other. 

Then, once each rental is done this way and applied to income or debt, they are going calculate your DTI and qualify or deny you based on the DTI requirements of that particular loan program (28%, 30%, 35%, 40%, 60+% back in 2005, whatever).The above underwriting method is know as "washing" the debt of each rental property with its income.Another way that they do it is they simply take the PITI of each property straight to the debt, and the rental income from each property straight to the income (usually also reduced to 75%); rather than washing it first.It is advantageous to the borrower's qualifications to "wash" the PITI with the rental income and then apply the remainder, whether positive or negative, to income or debt. 

Also don't be concerned about the 2% rule or the 1% rule or any other rules. 

- Since I already own 1 other rental property that I purchased last year (not including the one I'm selling), I'm concerned about getting financing on 2 other properties, which could total up to $700k in value if I was putting 20% down (the $140k).   

Only reason I could come up with is seller concerns about financing falling out.

@Graham Richard Anderson Search engine optimization and Google Adwords are by far the best lead generation methods.