It seems the seller concession is a more favorable choice since that closing cost reduction is provided all at once versus lower monthly payment by say $50-100 over a long period of time, say $10,000 concession in exchange for $50/month payment reduction, that's 200 months (almost 17 years) to break even.

This can be very expensive and is usually the worst choice to make because you can't justify the cost.2.

Zillow is usually sufficient but I like having a few options.

This can be very expensive and is usually the worst choice to make because you can't justify the cost.2.

Wauwatosa is a top choice, Washington Heights offers a similar feel minus the school district and at a lower price point.

It is YOUR choice but I do It…. anyone paying that little in rent will come out with the waterworks in tears to get you to not do it.

Just do your research and make wise choices.

Income/GRMs tends to vary widely in 2-4 unit properties and is not very consistent in my markets and therefore, typically doesn't seem too meaningful in my 2-4 unit reports.Won't the lender make the choice to lend on Comps or Income (???)

This is a typical supply/demand phenomenon, but it also is generally a function of their prowess in being able to market the opportunity properly and thus have the right conversations with suitable investors in sufficient quantity.  

It also looks like Rent Redi is a good choice to manage properties, especially with it being free through BP.